To be privately owned
Magenheim Castle

In the Heilbronn district, above the municipality of Cleebronn, lies Magenheim Castle, one of Germany's best-preserved Staufer-era castle complexes. This structure has origins dating back to the 13th century.
History+
The first mention of the locality of Magenheim dates to 793, though it later disappeared. The Lords of Magenheim appeared in the 12th century and possessed two nearby castles: the vanished Obermagenheim Castle and the present-day Niedermagenheim Castle, which formed the foundation for today's palace. Architectural studies suggest that Niedermagenheim Castle was built between 1220 and 1250 and underwent several modifications.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: https://commons.wikimedia.org/wiki/File:Burg_Magenheim_20120909.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: 49.0425, 9.0406