To be privately owned
Salvatorberg Abbey

The Salvatorberg Monastery, a historic complex in the Aachen city region, North Rhine-Westphalia, stands at approximately 242 meters above sea level. It is renowned for its long history and its role as a spiritual center in the region.
History+
The origins of Salvatorberg Monastery date back to the late 10th or early 11th century, with its establishment around 997 or 1005. It was dedicated to Saints Salvator, Corona, Apollinaris, Nikolaus, and John the Baptist. The community existed until its secularization in 1802. Over the centuries, it significantly shaped the religious and cultural life of the surrounding area.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:Aachen_11-11_Bergkirche_Salvator_02.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: 50.7842, 6.0859