To be privately owned
Seedorf Castle
On Lake Schaalsee in Schleswig-Holstein is Seedorf Castle, a historicist building. Once the manor house of the Seedorf estate, it showcases a Neo-Renaissance style that is unusual for the region.
History+
The history of the Seedorf estate is linked to various noble families. Early owners included the families von Seedorf, von Brockdorff, Scharpenberg, and von Lützow. The latter sold the estate to the von Witzendorff family, who already owned the nearby Groß Zecher estate. The Witzendorffs retained Seedorf until the late 19th century.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:Castle_in_Seedorf_%28Lauenburg%29.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: 53.6240, 10.8715