To be privately owned
Altshausen Castle

Altshausen Castle was once the residence of the Land Commandery of the Teutonic Order and now serves as the residence of the head of the House of Württemberg.
History+
The origins of Altshausen Castle lie in a fortress that served as the seat of the Counts of Altshausen, counts of the Eritgau, around 1004. Here, in 1013, Hermann the Lame was born, who later gained fame as a scholar and composer and was buried in the family crypt of the castle in 1054. In the 12th century, the counts moved their seat to Veringen. The castle and the village of Altshausen came into the possession of the Imperial Chamberlains of Bigenburg in 1246, who donated them to the Teutonic Order in 1264. After a fire in 1434, the remains of the old castle were rebuilt and extended several times. During the Thirty Years' War, the Old Castle burned down again and was restored in the Renaissance style from 1655 onwards. From 1691, the expansion of the New Castle began, and in 1729, Johann Caspar Bagnato was commissioned to plan a Baroque castle complex, of which only parts were realized.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://de.wikipedia.org/wiki/Datei:Altshausen_Schloss_Alter_Bau_2005.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: 47.9356, 9.5378