To be privately owned
CastleEuskirchen - Niederkastenholz
Niederkastenholz Castle

The former moated castle Niederkastenholz is located in the Euskirchen district of Niederkastenholz. It is an 18th-century rural architectural structure.
History+
The origins of the lordship of Niederkastenholz Castle and village date back to the 11th century. It was under the protection of the Duke of Jülich and belonged to the imperial abbey of Kornelimünster. This connection persisted until the secularization in 1804.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de/thread.php?threadid=568
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: 50.6213, 6.8355