To be privately owned
Schellenberg Castle

Schellenberg Castle in Essen-Rellinghausen is a rare example of a high-lying, two-part moated castle that evolved into a multifaceted complex.
History+
The origins of Schellenberg Castle date back to the 12th century, when it was first documented and owned by the noble lords of Broich. At the end of the 13th century, it passed to the Lords of der Horst, who still referred to it as “Haus opm berge”. In 1353, Knight Noldo von Kückelsheim acquired the castle. Through marriage, it came into the possession of Pilgrim von Leithen in 1388 and finally to Johann von Vittinghoff-Schell in 1452, whose family gave the castle its current name. The Vittinghoff-Schells inhabited the complex until 1909.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de/thread.php?threadid=575&sid=b99faef8d66dfe33c6cf4ace893f0e69
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: 51.4221, 7.0507