To be privately owned
Tann Castle

Tann Castle, a complex in the Renaissance and Baroque styles, is located in the town of Tann in the Hessian district of Fulda. It is the ancestral home of the von der Tann family and remains in their private ownership to this day. The castle's unique feature lies in its three-part structure, consisting of the Red, Blue, and Yellow Castles, which are grouped around an almost square inner courtyard.
History+
The origins of the current castle date back to the 12th century, when a lowland castle was built on this site by ministeriales. From the 16th century onwards, the development into the current castle complex began as the three family branches of the Ganerbenburg started to expand and rebuild it.
Source: Wikipedia · Licence: CC BY-SA 4.0
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: 50.6422, 10.0211