List of Scheduled Monuments in Anglesey
includes the largest island in Wales, as well as various smaller islands. Just as Anglesey is joined by bridges to the mainland, so Holy Island is linked to Anglesey. The 143 Scheduled monuments cover over 4,000 years of the history of the islands. Spread throughout the interior and especially the coast of the islands there are 89 prehistoric scheduled sites, including chambered tombs, burial cairns and standing stones, hillforts, hut circles and a henge. Six sites date from the Roman period, and seven from early medieval times. The 18 sites from the medieval post-Norman period include spectacular castles, remote dwellings, and wells, stones and churches. Finally the modern period is mainly agrarian in its purposes, but also includes the copper, coal and brickmaking industries. After a spell as part of Gwynedd, the Isle of Anglesey County now covers the same area as the historic county of Anglesey.
Scheduled monuments are found in 34 of the 40 Community areas on the Isle of Anglesey. Clusters are found in Moelfre on the eastern side, Trearddur on Holy Island, Llanidan overlooking the Menai Strait and Llangoed in the far east. One site, Beaumaris Castle, is part of a World Heritage Site and this plus a further 22 of the monuments are in the care of the Welsh heritage agency, Cadw.
Scheduled Ancient Monuments have statutory protection. The compilation of the list is undertaken by Cadw Welsh Historic Monuments, which is an executive agency of the National Assembly of Wales. The list of scheduled monuments below is supplied by Cadw with additional material from Royal Commission on the Ancient and Historical Monuments of Wales and Gwynedd Archaeological Trust.
Scheduled Monuments in Anglesey
The list is sorted by period, and then by Community so that sites of similar age and locality are placed near each other. Clicking on one of the heading arrows will sort the list by that information.| Image | Name | Site type | Community | Location | Details | Period | SAM No & Refs |
| Barclodiad y Gawres Burial Chamber | Chambered round barrow | Aberffraw | , SH329707 | Neolithic chambered tomb overlooking Trecastle Bay. Excavated in 1952-3 it is now consolidated, with lockable iron gates and a concrete domed roof. Several internal stones have Neolithic pecked geometric rock art. | Prehistoric | AN032 | |
| Din Dryfol Burial Chamber | Chambered long cairn | Aberffraw | , SH395724 | The burial mound developed over several phases of stone chambers and wooden posts, culminating in a high Portal Stone creating a substantial entrance. The mound has now gone, leaving the internal stone structures. | Prehistoric | AN008 | |
| Mynydd Bach round cairn | Round barrow | Aberffraw | , SH328708 | A low, grass covered cairn with a stone burial cist in its centre, on a promentary alongside the more impressive Barclodiad y Gawres. A fragment of Beaker pottery was found in a 1956 excavation suggesting a Bronze Age date. | Prehistoric Bronze Age | AN149 | |
| Trwyn Du round cairn | Round cairn | Aberffraw | , SH352678 | A Bronze Age cairn, excavated in 1956 and 1974, had regular sequence large and small kerbstones, some of which are still visible through the grass. The cairn was found to overlay a much older ground surface, which had a great quantity of flint workings, occupation material and two Tranchet axes dated to 7000BC in the Mesolithic. | Prehistoric | AN148 | |
| Werthyr standing stone | Standing stone | Amlwch | , SH415928 | Standing Stone 3m high between Y Werthyr and Bryn Llwyd farms. Early writings suggest there was a second upright and a long capstone, of which there is now no sign. | Prehistoric | AN150 | |
| Presaddfed Burial Chambers | Chambered tomb | Bodedern | , SH347808 | Two megalithic stone features, one a dolmen with huge capstone, the other a collapsed stone burial chambers. A 2m gap is between the two features, and it is thought a single mound would once have covered them both, though this has now disappeared without trace. In the care of Cadw, with public access. | Prehistoric | AN010 | |
| Malltraeth Yard standing stone | Standing stone | Bodorgan | , SH408693 | Large standing stone, high, beside a railway embankement, north of Malltraeth. It has variously been named Cae Dafydd Maenhir and Trefdraeth Standing Stone. It is a pale igneous rock with many quartz veins. | Prehistoric | AN089 | |
| Cremlyn Standing Stones | Standing stone | Cwm Cadnant | , SH571775 | Two standing stones in adjacent fields. The southern one fell over in 1977 and was found to have only 30 cm below ground and above, wedged in with packing stones. When replaced, it was concreted in. | Prehistoric | AN074 | |
| Hendrefor Burial Chambers | Chambered tomb | Cwm Cadnant | , SH551773 | Two stone chambers, apart, which would once have been buried under a single long mound. One was recorded as intact in 1802, but by 1825 only one upright remained standing, which remains high. Also called Ucheldref Burial Cairn. | Prehistoric Neolithic | AN025 | |
| Pen-y-Maen Standing Stone | Standing stone | Cwm Cadnant | , SH564739 | Slender standing stone, high, in a field near Llandegfan. The base has worn down to reveal packing stones. | Prehistoric | AN072 | |
| Ty-Wyn Standing Stone | Standing stone | Cwm Cadnant | , SH553739 | Tapering slab, high and wide, on a rise north of Menai Bridge. Also called Plas Cadnant Standing Stone and Ty Gwyn Standing Stone. Large packing stones are visible at the base. | Prehistoric | AN073 | |
| Pen-yr-Orsedd Standing Stones | Standing stone | Cylch-y-Garn | , SH333903 | Two large slab standing stones, apart. They are both over high and wide. The name may derive from 'Gorsedd'. | Prehistoric | AN081 | |
| Ty Mawr Standing Stone | Standing stone | Holyhead | , SH253809 | A contorted and irregular stone block with dramatic 'swirls' in the bedding plane. It stands on a prominent site south of Holyhead. | Prehistoric | AN012 | |
| Bryn Celli Ddu Burial Chamber | Burial Chamber | Llanddaniel Fab | , SH507701 | One of the finest passage tombs in Wales, with a mysterious pillar within the burial chamber, a 'Pattern Stone' carved with sinuous serpentine designs, and before all that it was a henge with a stone circle. Excavated and re-constructed in 1928-9. Now in the care of Cadw. | Prehistoric Neolithic | AN002 | |
| Bryn-Celli-Ddu Standing Stone | Standing stone | Llanddaniel Fab | , SH506701 | Low standing stone, wider than it is high. Only the presence of possible packing stones, and a suggested alignment with the nearby Bryn-Celli-Ddu chambered tomb indicate anything other than a natural boulder. | Prehistoric | AN085 | |
| Bryn-yr-Hen-Bobl Burial Chamber | Chambered round cairn | Llanddaniel Fab | , SH519689 | 'Hill of the old people' is a substantial mound with a stone chamber. Bones were found here in 1754, and along with Plas Newydd Burial Chambers it was included in the first Ancient Monuments Act in 1882. It was excavated by W J Hemp in 1929-35, and Neolithic pottery appeared to lie under and in front of the mound, suggesting a settlement predating its use as a burial site. The chamber was given a doorway following the dig, but is not accessible to the public. It is visible from the southern edge of Plas Newydd Garden Wood. | Prehistoric Neolithic | AN006 | |
| Plas Newydd Burial Chambers | Chambered tomb | Llanddaniel Fab | , SH519697 | Two adjoining stone chambers of a Neolithic burial cairn form a cromlech on private lawns of Plas Newydd National Trust Country House. The monument, along with nearby Bryn-yr-Hen-Bobl, was one of only three Welsh entries in the initial Schedule of the Ancient Monuments Protection Act 1882 | Prehistoric Neolithic | AN005 | |
| Tyddyn-Bach Standing Stone | Standing stone | Llanddaniel Fab | , SH503703 | The high pointed stone is surrounded by a pile of more recent field clearance boulders. Reportedly the stone is set into a hole or socket in the bedrock. A small tree has become established, growing through the boulders. | Prehistoric | AN084 | |
| Llanddona Standing Stone | Standing stone | Llanddona | , SH567796 | Small jagged and much weathered upright stone, tapering to a sharp point. It is near Bwlch Farm, west of Llanddona village. | Prehistoric | AN153 | |
| Hirdre-Faig Standing Stone | Standing stone | Llanddyfnan | , SH484746 | Large igneous slab, with distinctive quartz veins in a field east of Hirdre-Faig farm. It stands on a shallow ridge in an area known as Penmynydd. | Prehistoric | AN155 | |
| Llanddyfnan Standing Stone | Standing stone | Llanddyfnan | , SH501785 | Slender pillar, tall near the road to Llanddyfnan church. It had been leaning at an angle of 45° by 1970 and was set upright again some time before 1986. A museum of all things stone-related stands just over the road. | Prehistoric | AN071 | |
| Maen Addwyn | Standing stone | Llanddyfnan | , SH460833 | Ivy-covered 3m high stone beside a road. It was formerly known as Maen Fabli, whilst another stone,that stood 500m to the north, was called Maenaddwyn, and gave its name to the crossroads at which it stood. | Prehistoric | AN069 | |
| Tŷ Newydd Burial Chamber | Chambered tomb | Llanfaelog | , SH344738 | A huge capstone resting on three uprights formed a spectacular monument, described in 1865 as "one of the gems of the Anglesey Cromlechs". It was excavated in 1936 and a Beaker fragment indicated the Neolithic tomb was re-used during the Bronze Age. The monument is in the care of Cadw, with public access. In recent years, the capstone cracked, since which the whole has been supported by two brick piers. | Prehistoric | AN013 | |
| Capel Soar Standing Stone | Standing stone | Llanfaethlu | , SH319863 | Large and prominent standing stone beside the A5025 and close to a Baptist Chapel on an exposed part of north-west Anglesey. It is a slab, high, and wide at its base, tapering to a rounded top. | Prehistoric | AN083 | |
| Ty Mawr Burial Chamber | Chambered tomb | Llanfair Pwllgwyngyll | , SH538721 | This Burial Chamber on the eastern edge of Llanfair PG,, has a large capstone now resting on its collapsed support stones. It was a simple passage grave, suggesting an earlier date than most of the Anglesey neolithic tombs. | Prehistoric | AN037 | |
| Benllech Megalith: Goosehouse | Unclassified site | Llanfair-Mathafarn-Eithaf | , SH519826 | During sewer works in 1965 what was thought to be a small stone burial chamber was found in what is now an area of housing in Benllech. No ancient remains were found, and the presence of a medicine bottle suggested a more modern date. This left the question of what it might be. A stone goose-pen, corn drier, or a folly have all been suggested but are by no means convincing. In the absence of an explanation it retains its listed status. | Prehistoric | AN094 | |
| Glyn Burial Chamber, Benllech | Burial Chamber | Llanfair-Mathafarn-Eithaf | , SH514817 | Limestone capstone, which appears to be a piece of the local bedrock, levered up and propped in place by other stones. The rise in ground around it may represent a 14m circular mound or cairn that originally covered it. Partial excavation by E.N. Baynes in 1909 found that 'treasure seekers had cleaned out the whole of the chamber'. | Prehistoric | AN154 | |
| Pant-y-Saer Burial Chamber | Chambered tomb | Llanfair-Mathafarn-Eithaf | , SH509824 | Two large upright stones support a large capston, which now leans at a steep angle. It was 'plundered' in 1874 when a visitor dreamed of a crock of gold, but found only bones. A full excavation by Lindsay Scott in 1933 found late neolithic and early Bronze Age burials of 54 individuals. The base of the chamber was cut into the bedrock, and the whole was covered by a mound with stone edging. | Prehistoric | AN004 | |
| Henblas Burial Chamber | Chambered tomb | Llangristiolus | , SH425719 | Three enormous boulders: two blocky and fairly upright, the other a vast slab. They are thought to be glacial erratics which have not travelled far. Striation details suggest some manoeuvering has taken place, and therefore they were probably adapted to create a huge burial tomb. Unverified 19th century reports claimed to have found an urn containing ashes and a ring of blue glass. | Prehistoric | AN003 | |
| Bodowyr Burial Chamber | Chambered tomb | Llanidan | , SH462681 | Five surviving uprights formed the walls of a small stone chamber. Three of these now support a large mushroom shaped capstone, with one stone not reaching the capstone, and one fallen down. The whole, although never excavated, has been consolidated and fenced for protection from livestock and to facilitate public access.It is under the guardianship of Cadw, and commands spectacular vies of Snowdonia. | Prehistoric | AN007 | |
| Bryn Gwyn stones | Stone Circle | Llanidan | , SH462669 | Two huge standing stones on a field boundary and path east of Brynsiencyn. The taller is high, the tallest on Anglesey. Excavations in 2010 confirmed there were once 8 stones, forming a 16m wide circle, with a further stone inside the circle, perhaps aligning with the nearby henge at Castell Bryn Gwyn. | Prehistoric | AN022 | |
| Perthi-Duon Burial Chamber | Chambered tomb | Llanidan | , SH479667 | Massive stone long-identified as a possible burial chamber capstone, in a field west of Brynsiencyn. Doubts have been expressed on whether it was used in such a way, or is simply a glacial erratic. | Prehistoric | AN059 | |
| Trefwri Standing Stone | Standing stone | Llanidan | , SH476677 | There are two standing stones at the eastern end of the prehistoric settlement of Trefwri. The smaller stone,, is less convincing as an ancient stone than the larger one 200m to the east. | Prehistoric | AN086 | |
| Llech Golman | Standing stone | Llannerch-y-medd | , SH451831 | large blocky standing stone on an undulating ridge. It is high, with packing stones exposed around the base. | Prehistoric | AN070 | |
| Bodewryd Standing Stone | Standing stone | Mechell | , SH406902 | At some 4m high this stone slab is one of the tallest standing stones on Anglesey. | Prehistoric | AN078 | |
| Baron Hill Maen Hir | Standing stone | Mechell | , SH369916 | A large standing stone 410m North of St Mechell's Church, Llanfechell. During re-seating of the stone in 2010, it was found that one of the packing stones had prehistoric patterned carvings. | Prehistoric | AN080 | |
| Llanfechell Triangle Standing Stones | Standing stone | Mechell | , SH363916 | Three Bronze Age Standing Stones, each some 2m high, at the top of a low ridge. | Prehistoric | AN030 | |
| Lligwy Burial Chamber | Chambered tomb | Moelfre | , SH501860 | Huge capstone supported by 8 side stones, all of locally occurring limestone. Described in 1781, excavated in 1909, it contained numerous Neolithic flints and pots, along with 15-30 human burials. Possible East, West and South alignment of stones suggest astronomical purposes | Prehistoric | AN009 | |
| Ogof Arian Cave | Cave | Moelfre | , SH485881 | Cave with an inner chamber that runs some 25m into the hillside. Neolithic flint tools have been found. Know locally as Ogof Ladran. | Prehistoric | AN106 | |
| Plas Bodafon Standing Stone | Standing stone | Moelfre | , SH476855 | In woodland west of Plas Bodafaon, the stone is 1.3m high, of an unusual quartzite. | Prehistoric | AN151 | |
| Carreg Leidr | Standing stone | Rhosybol | , SH446843 | Upright stone, with an unusual bulbous top. This gave rise to a legend that a thief who had stolen books from the nearby Llandyfrydog Church was turned to stone. The name means 'Thief Stone'. | Prehistoric | AN067 | |
| Llys Einion Standing Stone | Standing stone | Rhosybol | , SH429858 | small, regular stone in a field south of Rhosybol village. Two vertical grooves on the north side could have been caused by lightning strikes. | Prehistoric | AN077 | |
| Maen Chwyf | Chambered tomb | Rhosybol | , SH432857 | What some have identified as a large capstone propped up on supporting stones, others suggest is a natural boulder, indistinguishable from other local geology.In the absence of excavation doubts persist on both sides. | Prehistoric | AN076 | |
| Penrhos Feilw Standing Stones | Standing stone | Trearddur | , SH227809 | Two tall standing stones, high and a similar distance apart. The 1860s had recorded suggestions of a cist burial and a stone circle, but neither is in evidence. They area also known as the Plas Meilw standing stones. | Prehistoric | AN017 | |
| Trefignath | Chambered round barrow | Trearddur | , SH258805 | Neolithic tomb, expanded over three periods, each building a new chamber to the east of the previous, retaining the original alignment. It was noted in 1655, with 18th century plundering of the cairn and capstones, and reported finds of urns and bones. The most recent chamber, in use until 2250 BC, retains an elaborate entrance with tall upright portal stones. Full excavation in 1977-9 by Christopher Smith was followed by consolidation and good public access. | Prehistoric | AN011 | |
| Glan-Alaw Standing Stone | Standing stone | Tref Alaw | , SH368857 | Large slab of stone, high and almost as wide, but only thick, standing in a field between Glan Alaw and Bod-deiniol farms, east of Llyn Alaw. | Prehistoric | AN090 | |
| Tregwehelydd Standing Stone | Standing stone | Tref Alaw | , SH340831 | Accessible from a footpath via Tregwehelydd Farm. It is some high, and a more or less even rectangular shap, but it has split along its bedding planes, and is now in three pieces, which were bolted back together in 1969, with large metal straps. | Prehistoric | AN018 | |
| Castellor Hut Group | Unenclosed hut circle | Bryngwran | , SH335761 | There were said to be upwards of 26 round huts, with low walls, paved surfaces, and an impressive selection of Iron Age and some Roman finds. Many of these huts were plundered for stone before a survey and excavations in 1871, and 1900, which found quern, coins, and copper ingots. Six hut outlines remain, and the field has been much ploughed. A possible stone burial chamber has been described on the western side of the scheduled area. | Prehistoric Iron Age | AN088 | |
| Enclosed Hut Group West of Mariandyrys | Enclosed hut circle | Llanddona | , SH596812 | Well preserved survival of a group of round, stone-walled hut sites, with two rectangular huts, all enclosed by a low bank. Provides a good comparison with Din Lligwy, AN023. | Prehistoric Iron Age | AN126 | |
| Llanddona Hut Circle | Unenclosed hut circle | Llanddona | , SH573795 | Circular earthworks of a prehistoric roundhouse west of Llanddona. Although the banks are up to wide now, they probably represent a collapsed stone wall some thick and over a metre high, with perhaps a diameter. A conical roof would have stood on this, rising to an impressive or more in height, to make a large communal living space. It is listed as 'Hut Circle West of Buarth Cyttir'. | Prehistoric Iron Age | AN128 | |
| Caerhoslligwy Enclosed Hut Groups | Enclosed hut circle | Llaneugrad | , SH489851 | Two related sites, 200 metres apart, with evidence of Iron Age hut circles. The more southerly site has a walled enclosure, and at least three buildings. Growth of trees and scrub, along with dumping of quarried material has obscured what detail there was for most of the huts. | Prehistoric | AN105 | |
| Bwlch Hut Group, Benllech | Enclosed hut circle | Llanfair-Mathafarn-Eithaf | , SH512816 | Variously described as a roundhouse settlement near Coed y Bwlch, Bryn Engan and Coed y Glyn, two hut circles stand on the edge of a strip of woodland southwest of Benllech. Impressive orthostats of thick rubble-filled walls suggest huts with an internal diameter of over. A nearby boundary wall and rectangular building may be an enclosure wall from the same Iron Age or Romano-British period. | Prehistoric | AN127 | |
| Pant-y-Saer Hut Circles | Enclosed hut circle | Llanfair-Mathafarn-Eithaf | , SH513824 | Stone remains of two roundhouses and two ancillary rectangular buildings, within a drystone walled oval enclosure across. The smaller hut has interesting stone platforms around the sides, identified as sleeping places. The site was excavated in 1931 and 1933, with numerous Iron Age and Romano-British finds, plus a 6th-century penannular brooch suggesting a continued occupation into early Medieval times. | Prehistoric | AN043 | |
| Penmon Deer Park Hut Groups & Terraces | Enclosed hut circle | Llangoed | , SH627810 | Several Iron Age enclosure earthworks, each with one or more roundhouses. Part of a wider landscape of Iron Age fields. | Prehistoric | AN044 | |
| Graiglas Barrow | Round barrow | Llangristiolus | , SH415748 | Burial mound, across and high, beside a minor road, on a low ridge near the Mona industrial estate. A fallen standing stone is close by to the north. | Prehistoric | AN112 | |
| Tyddyn Sadler Hut Group | Enclosed hut circle | Llangristiolus | , SH411737 | Several square and round huts grouped amongst a network of field systems, and probably dating to Iron Age or Roman period. The wider area was noted in 1871 for its hut circles and embankments, but this particular group was first identified and documented in 1977. | Prehistoric | AN122 | |
| Castell Bryn Gwyn | Henge & enclosure | Llanidan | , SH465670 | Revetted stone walls surround a level area some 54 metres in diameter. An earlier bank and ditch belong to a henge from the end of the Neolithic period. During the Iron Age the present wall was built, and it was refortified in Roman times and later. | Prehistoric | AN015 | |
| Pont Sarn-Las Hut Group | Unenclosed hut circle | Llanidan | , SH471678 | Circles in the field, with evidence of surviving stonework. Roman coins and other finds were reported in the 18th and 19th centuries, along with the suggestion that it was part of a large pre-Roman settlement of Trefwri, perhaps extending to Caer Leb 500m to the south. | Prehistoric | AN087 | |
| Brynsiencyn Round Barrow | Round barrow | Llanidan | , SH488669 | Large unexcavated round barrow on a gentle slope, east of Brynsiencyn. Also known as 'Round barrow west of Carn or Garn'. | Prehistoric | AN060 | |
| Cors-y-Bol Round Barrow | Round barrow | Llannerch-y-medd | , SH375843 | Possible ring cairn, barrow, or perhaps enclosure, it was noticed by a farmer in 1956, on the edge of a bog which drains into Llyn Alaw. Also referred to as 'Cor y Bal'. | Prehistoric | AN091 | |
| Llifad, Carreglefn | Enclosure | Mechell | , SH384910 | A later prehistoric pentagonal enclosure, 49 yards across. It is a possible defended settlement and stands a few hundred metres south of Pen-y-Morwydd Barrow. | Prehistoric | AN079 | |
| Pen-y-Morwyd Round Barrow | Round barrow | Mechell | , SH384912 | Prominent burial mound on a hill-top between Llanfechell and Bodewryd. It is across, and high, crossed by a modern wall. A footpath from Rhosbeirio crosses the mound. | Prehistoric Bronze Age | AN110 | |
| Bwlch-y-Dafarn Hut Group | Enclosed hut circle | Moelfre | , SH492856 | Roughly rectangular walled enclosure. Within it a well defined roundhouse, 6m across with paved floor, had Roman pottery finds. There are also two large rectangular buildings. | Prehistoric | AN104 | |
| Glan'r Afon Hut Circle | Unenclosed hut circle | Moelfre | , SH500854 | Hut circle of 8m diameter with rubble-filled 1.3m thick walls, up to 0.8m high. Now in thick woodland, rectangular buildings alongside have also been recorded. | Prehistoric | AN095 | |
| Marian-glas Hut Group | Unenclosed hut circle | Moelfre | , SH501846 | A roundhouse settlement, also called Cae Marh, with several huts with thick walls, some standing up to 1.4m high. Some of the hut walls are now obscured by a thicket, while others are visible as wall lines in the lawns of Marianglas caravan park. A sign by the Ministry of Public Building and Works indicates the location. | Prehistoric | AN093 | |
| Parc Salmon Hut Group | Unenclosed hut circle | Moelfre | , SH500861 | Circular hut and a nearby mound of discarded shellfish, with pottery and other items including half of a bronze ring. The hut had flooring of cobbles set in the earth, and a mortar stone set into the floor. | Prehistoric | AN102 | |
| Pen-y-Fynwent Barrow | Round barrow | Rhosybol | , SH434889 | A low burial mound, some across and 1m high, and thought to be Bronze Age. It is in the same field as the Medieval Pen-y-Fynwent Enclosure. | Prehistoric | AN125 | |
| Hut Circle Settlement at Capel Llochwydd | Enclosed hut circle and Chapel site | Trearddur | , SH214828 | Multi-period site, on the cliff top near South Stack on Holy Island. The walls of a ruined Medieval chapel are cut into the enclosure walls and hut circles of an Iron Age settlement. The Bronze Age burial mound of Gosgarth Bay round cairn is a few yards up the slope. The site was, until the 1770s, the setting for local festival day gatherings, when young people would attempt 'matrimonial divining' | Prehistoric & Medieval | AN133 | |
| Gogarth Bay round cairn | Round cairn | Trearddur | , SH214827 | Round cairn on the summit of a coastal ridge known as Garn, close to the Llochwydd chapel and hut site at AN133. The large low mound of stones is a Bronze Age burial cairn, with dramatic views of the coast and area. | Prehistoric | AN147 | |
| Holyhead Mountain Hut Circles | Hut circle settlement | Trearddur | , SH212820 | This collection of over 20 impressive unenclosed circular stone huts at Ty Mawr, near South Stack, has been in the care of the state since 1911. Some 50 hut sites were noted by W O Stanley in 1862, many of which are no longer visible. The site is now within the South Stack Cliffs RSPB reserve. Evidence for occupation from the Mesolithic through to Early Medieval periods has been found, but the main standing remains are from the Iron Age. | Prehistoric | AN016 | |
| Plas Meilw Hut Circles | Unenclosed hut circle | Trearddur | , SH230809 | Collection of Iron Age huts, of which two now remain as visible circles. They were excavated in 1868 by William Owen Stanley who identified 12 round huts and two rectangular buildings. A fireplace, stone flooring, quernstones, a variety of hammers, pounders, grinding stones, spindlewhorls, whetstones and pottery were found along with possible evidence of copper smelting. By 2013 the site was overgrown with brambles and gorse. | Prehistoric | AN033 | |
| Porth Dafarch Hut Circles | Round barrows and Settlement | Trearddur | , SH234800 | Complex coastal site with two Bronze Age burial mounds overlaid by Romano-British hut circles that had become buried by wind-blown sand. These were investigated by William Owen Stanley in 1878, with further excavations by B. H. St. John O'Neill of the Ministry of Works prior to road-widening in 1939 which then obliterated some of the settlement. The hut group comprised at least two circular huts with low stone walls and a central post-hole, with hearths suggesting several different phases of occupation. A selection of 2nd to 4th century finds included sherds of Samian ware pottery, a glass bead, a later Iron Age bronze tankard handle, a collection of stone objects including spindle whorls and rotary querns, a pennanular brooch and a carnelian intaglio. The finds are now held by National Museum Wales. | Prehistoric | AN034 | |
| Tre-Arddur Hut Group | Enclosed hut circle | Trearddur | , SH262798 | Identified in 1959 as a group of three circular hut foundations, the site has not had any excavations. It is now mostly obscured by gorse thickets within the Trearddur Bay Caravan Park. It dates to the 1st century BC and its location on an east-facing knoll overlooking the channel between Holy Island and Anglesey, suggests a link with a similar hut group on the far bank of the channel on the Ynys Leurad peninsular in Valley Community, perhaps indicating the two sides of a ferry route. | Prehistoric | AN092 | |
| Bedd Branwen Round Cairn | Round barrow | Tref Alaw | , SH361849 | Bronze Age cairn beside the River Alaw. An excavation of 1813 found a cremation urn, and linked the site to the burial of Branwen. The cairn has a central pillar dated to before 2000BC, and the mound raised around it soon after 1400BC. Up to 12 cremated burial urns have been identified in an excavation of 1966. | Prehistoric | AN098 | |
| Ynys Leurad Hut Circles | Hut circle settlement | Valley | , SH277790 | Prehistoric | AN035 | ||
| Tywyn-y-Parc Promontory Fort | Promontory Fort - coastal | Bodorgan | , SH368649 | The fort is defined by a substantial bank running across the neck of the promentary with a possible gate at the northern edge. 70m long, 8m wide and 2.5m high, it forms a substantial barrier, and has two shorter sections of outer walls which overlap slightly. | Prehistoric | AN049 | |
| Y Werthyr Hillfort | Hillfort | Bryngwran | , SH374782 | Oval earthwork bank, 200m across, crossed through its western edge by the B5112 2 km NW of Gwalchmai in central Anglesey, Wales. Iron Age defensive double banked hillfort on a low hilltop, now quite faint on the ground, but the outline of which is retained in a hedge line west of the road. | Prehistoric | AN042 | |
| Dinas Gynfor Hillfort | Hillfort | Llanbadrig | , SH390950 | Prehistoric | AN038 | ||
| Din Sylwy | Hillfort | Llanddona | , SH586814 | Also called Bwrdd Arthur, the earthworks enclose a relatively flat, partly overgrown area, 600 yards from the Irish Sea. Two entrances have been detected. | Prehistoric | AN024 | |
| Castell near Tre-Fadog | Promontory Fort - coastal | Llanfaethlu | , SH290858 | Prehistoric | AN082 | ||
| Caer Idris Hillfort | Hillfort | Llanidan | , SH494679 | Prehistoric | AN051 | ||
| Dinas Cadnant Hillfort | Hillfort | Menai Bridge | , SH551733 | Prehistoric | AN048 | ||
| Coed Newydd Boiling Mounds & Smelting Hearth | Burnt mound | Moelfre | , SH488858 | Prehistoric | AN103 | ||
| Din Lligwy Hut Group | Enclosed hut circle | Moelfre | , SH497861 | Stone foundation walls of a group of Iron Age houses and workshops, surrounded by an enclosing wall. | Prehistoric | AN023 | |
| Caer y Tŵr | Hillfort | Trearddur | , SH219829 | A Roman-era hillfort on the summit of the Holyhead Mountain. Now mostly rubble, but its walls can still be made out, including a large stone rampart on the north and east sides. | Prehistoric | AN019 | |
| Dinas Porth Ruffydd | Hillfort | Trearddur | , SH222794 | Prehistoric | AN121 | ||
| Y Werthyr Hillfort | Hillfort | Tref Alaw | , SH363843 | Bivallate hillfort on an imposing hill top. Ramparts are now mostly ploughed out. | Prehistoric | AN158 . | |
| Capel Eithin and Cemetery | Chapel | Llanfihangel Ysgeifiog | , SH490726 | Prehistoric | AN120 | ||
| Bryn Eryr Rectangular Earthwork | Enclosure | Cwm Cadnant | , SH540756 | Roman | AN100 | ||
| Hendrefor Earthwork | Enclosure | Cwm Cadnant | , SH545765 | Roman | AN075 | ||
| Caer Gybi Roman Fortlet | Fort | Holyhead | , SH247826 | Small fortlet at the centre of Holyhead. Possibly a late-4th-century outpost for Segontium, to defend Anglesey from Irish sea-raiders | Roman | AN031 | |
| Parciau hill fort | Hillfort | Llaneugrad | , SH494846 | Roman | AN041 | ||
| Caer Lêb | Enclosure | Llanidan | , SH472674 | Roman | AN014 | ||
| Bodafon Mountain Hut Groups | Enclosed hut circle | Moelfre | , SH470849 | Roman | AN040 | ||
| Pen-Sieri Inscribed Stone | Inscribed stone | Aberffraw | , SH334706 | Early Christian memorial stones with the words 'MAILIS' , plus some Ogham text, suggesting 5th or 6th century date. In 1802 it was in use as a barn lintel. In 2002 it was relocated inside a farm building at Trecastell Farm. | Early Medieval | AN058 | |
| Bodedern Early Christian Cemetery | Cemetery | Bodedern | , SH341799 | Early Medieval | AN099 | ||
| Bodfeddan Inscribed Stone | Inscribed stone | Llanfaelog | , SH356745 | Standing Stone 2m high, alongside the A4080 1 km north of Pencarnisiog. Inscribed on Northern face is the text CVNOGVS_HIC IACIT. The text is dated to the 5th or 6th century AD, but a well-defined cup mark may indicate the stone is a prehistoric item. | Early Medieval | AN021 | |
| Penmon Cross | Cross | Llangoed | , SH630807 | Early Medieval | AN063 | ||
| St Seiriol's Well, Penmon | Holy Well | Llangoed | , SH630808 | Early Medieval | AN062 | ||
| Monastic Settlement on Puffin Island | Monastic settlement | Llangoed | , SH651821 | Early Medieval | AN064 | ||
| Mynwent y Llwyn | Chapel? | Llangristiolus | , SH459730 | Broad mound on Malltraeth marsh, beside the old A5. It has long been suggested, and doubted, as the site of a chapel, however a resistivity survey in 1970 found the foundations of a rectangular building. The name means 'the burial ground of the grove' | Early Medieval? | AN065 | |
| Llangaffo inscribed stones | Cross shaft | Rhosyr | , SH445685 | In the churchyard of St Caffo's Church, Llangaffo, there is a part of a 9th-century stone cross, and inscribed gravestones from the 9th to 11th centuries | Early Medieval | AN053 | |
| Beaumaris Castle | Castle | Beaumaris | , SH607762 | One of the most famous castles of Edward I. Part of the Castles and Town Walls of Gwynedd World Heritage site | Medieval | AN001 | |
| Beaumaris Town Wall | Town Wall | Beaumaris | , SH604762 | Medieval | AN123 | ||
| Llanfaes Friary | Friary | Beaumaris | , SH609773 | Medieval | AN134 | ||
| Hafoty Medieval House | House | Cwm Cadnant | , SH562781 | Medieval | AN097 | ||
| Castell Crwn | Ringwork | Cylch-y-Garn | , SH331908 | Medieval | AN029 | ||
| St Michael's Church, Llanfihangel Ysgeifiog | Church | Llanfihangel Ysgeifiog | , SH478734 | Medieval | AN052 | ||
| Plas Berw | House | Llanfihangel Ysgeifiog | , SH465717 | Medieval | AN057 | ||
| Tre-Garnedd Moated Site | Moated Site | Llangefni | , SH468746 | Medieval | AN047 | ||
| Aberlleiniog Castle | Motte | Llangoed | , SH616793 | Civil War stone fortifications on a medieval motte | Medieval | AN020 | |
| Penmon Priory | Priory | Llangoed | , SH630807 | Early medieval religious foundation that was an Augustinian Priory by 1237 | Medieval | AN027 | |
| Old Church of St Nidan, Llanidan | Church | Llanidan | , SH494669 | Medieval | AN054 | ||
| Capel Lligwy | Chapel | Moelfre | , SH499863 | 12th century ruined chapel with a 16th-century side chapel with a vault beneath. At some point it became a private place of worship for a nearby house, then later fell into disrepair and now has no roof, but stands as a picturesque ruin. | Medieval | AN056 | |
| Ffynnon Allgo | Holy Well | Moelfre | , SH498847 | Medieval | AN068 | ||
| Traeth Lligwy Fish Weir | Fish weir | Moelfre | , SH500872 | Fish trap built as a crescent of rocks near the low-tide mark of Lligwy Bay, near Moelfre, Anglesey. It is of uncertain date, is covered at high-tide, and was used to trap fish in the pond it creates at low-tide. | Medieval | AN144 | |
| St Gwenfaen's Well | Holy Well | Rhoscolyn | , SH259754 | An early medieval holy well in the south west of Holy Island, named after St Gwenfaen, whose cloister was nearby. Also known as Ffynnon Gwenfaen. | Medieval | AN055 | |
| Pen-y-Fynwent Enclosure | Enclosure | Rhosybol | , SH433888 | Medieval or pre-medieval homestead enclosure, and suggested site of a chapel. The enclosure survives as a low bank. No trace now remains of the chapel, which 19th century sources named variously as Bettws Bwchwdw, Capel Tegeryn, and a Church dedicated to St Morwenna. A Bronze Age Mound is in the same field. | Medieval | AN124 | |
| Llys Rhosyr | Manor | Rhosyr | , SH419653 | Thirteenth century llys, a court of the princes of Gwynedd, excavated in 1993. It went out of use during the 14th century when the nearby 'new borough' was founded, and the llys was buried by the dunes. | Medieval | AN129 | |
| St Dwynwen's Church | Church | Rhosyr | , SH387627 | Medieval | AN046 | ||
| Pont Aberffraw | Bridge | Aberffraw | , SH355689 | Bridge over the Afon Ffraw at Aberffraw, built by Sir A. Owen in 1731. A walled causeway continues to the east over the large expanse of sand dunes of Tywyn Aberffraw. The bridge is now only open to pedestrians. | Post-Medieval /Modern | AN101 | |
| Parys Mountain | Tower | Amlwch | , SH441903 | Windmill, Engine House, Precipitation Pits and Great Opencast | Post-Medieval /Modern | AN111 | |
| Gorad Friars Bach Fish Weir | Fish weir | Beaumaris | , SH615777 | Post-Medieval /Modern | AN140 | ||
| Llanddona Fish Weir | Fish weir | Llanddona | , SH572812 | A post medieval intertidal fish trap at the eastern end of the beach at Red Wharf Bay near Llanddona. | Post-Medieval /Modern | AN137 | |
| Parciau Dovecot | Dovecote | Llaneugrad | , SH497839 | Post-Medieval /Modern | AN036 | ||
| Coed Mor Fish Weir | Fish weir | Llanfair Pwllgwyngyll | , SH542713 | Post-Medieval /Modern | AN138 | ||
| Gorad Ddu Fish Weir | Fish weir | Llanfair Pwllgwyngyll | , SH545715 | Post-Medieval /Modern | AN139 | ||
| North Weir and Smoke Tower, Ynys Gorad Goch | Fish weir | Llanfair Pwllgwyngyll | , SH544712 | Post-Medieval /Modern | AN096 | ||
| Felin Carnau Tide Mill | Tidemill | Llanfair-yn-Neubwll | , SH298760 | Post-Medieval /Modern | AN131 | ||
| Felin Wen Tide Mill | Tidemill | Llanfair-yn-Neubwll | , SH295772 | Post-Medieval /Modern | AN130 | ||
| Aberlleiniog Fish Weir I | Fish weir | Llangoed | , SH625792 | Post-Medieval /Modern | AN142 | ||
| Aberlleiniog Fish Weir II | Fish weir | Llangoed | , SH625793 | Post-Medieval /Modern | AN143 | ||
| Penmon Dovecote | Dovecote | Llangoed | , SH631807 | Post-Medieval /Modern | AN061 | ||
| Trecastell Fish Weir | Fish weir | Llangoed | , SH621786 | Post-Medieval /Modern | AN141 | ||
| Bodafon Mountain Early Medieval Homestead | Settlement | Moelfre | , SH471846 | Post-Medieval /Modern | AN039 | ||
| Bodior Tide Mill | Tidemill | Rhoscolyn | , SH287767 | Post-Medieval /Modern | AN132 | ||
| Hendai Medieval Farmstead | Farmstead | Rhosyr | , SH404637 | Post-Medieval /Modern | AN108 | ||
| Newlands Fish Weir | Fish weir | Valley | , SH290807 | Post-Medieval /Modern | AN145 | ||
| Dyffryn Adda Copper Furnace and Precipitation Ponds | Copper mine | Amlwch | , SH438913 | Post-Medieval /Modern | AN135 | ||
| Mona Mine | Copper mine | Amlwch | , SH446903 | Kilns and Sublimation Chambers at Mona Mine, Mynydd Parys | Post-Medieval /Modern | AN136 | |
| Porth Wen Brickworks | Brickworks | Llanbadrig | , SH401946 | A now disused Victorian brickworks which produced fire bricks. The substantial remains include a number of buildings and the remains of some of the machinery. | Post-Medieval /Modern | AN109 | |
| Quay on the Stanley Embankment | Quay | Valley | , SH281999 | The Quay is the best preserved element of Thomas Telford's Stanley Embankment, the causeway between Holyhead and Anglesey. It was built in 1823 as the final link in the London to Holyhead Road. The angles of the masonry walls allowed ships to moor alongside the large unloading area. The main change in the original design is the addition of a higher parapet. | Post-Medieval /Modern | AN146 | |
| Berw Colliery | Colliery | Llanfihangel Ysgeifiog | , SH463724 | Post-Medieval /Modern | AN152 |