The church can be visited
Marienrode Priory

The Marienrode Monastery, a historic complex located in the Hildesheim region of Lower Saxony, is a site of significant cultural and religious heritage. It is notable for its long history and its revival as a spiritual center.
History+
The foundation of Marienrode Monastery dates back to 1125. Initially established as an Augustinian monastery, it later transformed into a Cistercian monastery. This transition occurred in 1259 when the Cistercians took over the site and gave it the name Marienrode, dedicated to Saint Mary and Archangel Michael. Over the centuries, the monastery underwent various construction phases, including a comprehensive renovation of the convent buildings in a simple Baroque style between 1717 and 1729. Secularization ended its monastic use in 1806. After a period of secular ownership, the monastery was re-established by Benedictine nuns in 1988 and is now part of the Beuron Congregation.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: https://de.wikipedia.org/wiki/Datei:Hildesheim-Marienrode_StMichael_Suedwest.jpg
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 52.1139, 9.9143