Uninhabited
Plötzkau Castle

In Saxony-Anhalt, Plötzkau Castle is a Renaissance castle built on the foundations of a medieval count's castle. It gained historical significance as the residence of Prince August of Anhalt, who in the 17th century made it the center of one of the smallest sovereign states of its time.
History+
The castle's origins date back to 1049, when the medieval circular castle was first documented. Bernhard von Hecklingen is considered the first Count of Plötzkau. In the 12th century, the Counts of Plötzkau were associated with the imperial house, but the family died out in 1147. A dispute over the inheritance between Albrecht the Bear and Henry the Lion led to the destruction of the castle by Archbishop Konrad of Magdeburg in 1139. Later, Plötzkau fell to Gernrode Abbey. In 1436, Prince Bernhard IV of Anhalt-Bernburg seized the fief.
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: 51.7441, 11.6886