Uninhabited
Marquardt Castle

Marquardt Castle, a historic estate in Potsdam-Marquardt, Brandenburg, once served as a noble residence, summer retreat, and hotel.
History+
The origins of the site date back to the 9th century, when an Old Slavic fishing settlement existed here. In 1313, the original place name Skoryn was first documented. From 1375, there were two manor farms, which Moritz Andreas von Wartenberg consolidated into a knight's estate in 1660. Marquard Ludwig von Printzen, a civil servant, acquired the property in 1704 and renamed it after his first name. After several changes of ownership, the estate was acquired in 1795 by General Hans Rudolf von Bischoffwerder, a confidant of King Frederick William II. Bischoffwerder, a member of the Rosicrucian Order, used the castle for spiritualist sessions with the king. A fire in 1791 destroyed parts of the manor house, which was later rebuilt. In 1860, the castle passed into bourgeois ownership.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Marquardt,_Schloss,_2.jpg?uselang=de
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: 52.4579, 12.9631