To be privately owned
Kummerow Castle

Kummerow Castle, a Baroque palace, is located in Kummerow am See in the Mecklenburg Lake District. Its location directly on the shore of Lake Kummerow.
History+
The first documented mention of Kummerow dates back to 1222, with the town already receiving town rights in 1255. In 1309, Heinrich von Maltzahn served as the castle bailiff. A siege of the castle in 1315 was unsuccessful. After 1320, the Duke of Pomerania withdrew the fief from the Lords of Maltzahn, which was granted to the pastor of Kummerow in 1368. Around 1420, the property returned to the Maltzahn family. A Mecklenburg-Pomeranian feud in 1450 led to the conquest of the castle and bailiwick, which fell to Mecklenburg after the peace treaty. After another war in 1481, Kummerow again became Pomeranian and returned as a fief to the Maltzahns. From 1573 to 1671, disputes between the Maltzahns, the town, and Dargun Monastery characterized the region. The Thirty Years' War left Kummerow devastated, with only 16 survivors. Subsequently, it became Swedish property under General Baron Bleichert. In 1671, Kummerow lost its town rights, and the Maltzahn family once again became owners, which was confirmed in 1741 by Frederick II of Prussia.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Kummerowamsee-schloss.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: 53.7701, 12.8308