To be privately owned
CastleKeyenberg
Keyenberg Castle

Haus Keyenberg may preserve the location of the fortified Prüm manor. In the 12th century, it was the seat of a family of the same name, and from the 16th to 18th centuries, it was a knight's estate eligible for the state parliament.
Source: wehrbauten.de
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Location: 51.0853, 6.4127