The earliest record of its construction dates to 1 August 1004. From a deed signed by Emperor Henry II it emerges that either a new monastery was erected or a major renovation had taken place. It was designed as a flat-roofed church with three double bays and simple alternation of piers and columns in the nave. Even today the walls of the central nave, five columns with Ottoniancapitals and the southern wing of the transept retain this structure. In very recent times new excavations have taken place, which have revealed the northern aisle that had been lost around 1660, as well as part of an angular foundation in the area of the transept. This could have belonged to a previous building. In the 12th century extensive modifications were carried out: the imposing west transom with its two towers was built, the church was arched and the tiered stalls added. During the peasants' war the building was badly damaged. In 1599 a fire was started by a band of robbers, whose ringleader was never captured. After makeshift repairs, more modifications were carried out during the Baroque era. In the 20th century attempts have been made to recover the original structure in places and the crypt was re-opened to its halfway point. The abbey buildings are part of the Romanesque Road, a tourist route in Saxony-Anhalt.
Grave slab of St. Adelbrin (d. ca. 900)
Adelbrin was the legendary first abbess of the monastery. The non-contemporary grave monument is preserved in the crypt of the church which is accessible from the outside. It is sandstone grave slab engraved with figures and leaning against a wall. The narrow side leans on a plain grave slab. Adelbrin was the legendary founder of the abbey and a saint. She is believed to be the sister of the two founders of the abbey, Theti and Wikker.
Gardens
The abbey gardens are part of the tourist project "Dream Gardens - Historic Parks in Saxony-Anhalt". The present external area was recreated in Anhalt based on a plan drawn by J. A. Dieckmann in 1737. Following the abbey's acquisition at that time by the Counts of Stolberg-Wernigerode, the courtyard and gardens were relaid. As part of this the convent gardens with their prayer houses and the abbess's gardens were established; these remain part of the garden scenery even today. Around 1730, as part of this renovation, a lime tree was planted in the abbey courtyard. This "abbey lime" - almost 300 years old - is now a natural monument for the district of Harz.