To be privately owned
Goldbeck Castle

On the southern edge of the village of Goldbeck in Brandenburg rises Goldbeck Castle, a former moated castle. Its special feature is a narrow one-man postern gate next to the main gate, which is unique in Brandenburg in this form.
History+
The first documented mention of the village of Goldbeck dates back to 1247, when it belonged to the Lords of Werle. Following conflicts in 1276 between Margrave Otto V of Brandenburg and the Lords of Werle, the territory fell to the Counts of Ruppin, who had to acknowledge the feudal lordship of the Bishops of Havelberg.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Roland Neubert, Halle (Saale)
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: 53.1310, 12.5138