To be privately owned
Gießen Castle

Gießen Castle, a high-medieval castle complex, is located in the Gießen district of Kressbronn in the Lake Constance district, Baden-Württemberg. Originally conceived as a motte-and-bailey castle, it evolved into a moated castle, whose moat was once supplied with water via a canal. Its location served to secure an important crossing of the Argen river.
History+
The origins of Gießen Castle likely date back to before 1250, although its first documented mention is from 1357. The early owners were the Lords of Wolfurt. In 1405, the Lindau Holy Spirit Hospital acquired the castle from Ulrich and Wolf von Wolfurt for 3,000 Rhenish guilders, as the heirs were unable to maintain the property. The castle then became the administrative center of the hospital's estates in the lower Argen valley and the focal point of the Hospital's Lower Court of Gießen and Laimnau. Between 1482 and 1486, despite protests from the Count of Montfort, the complex was reinforced with a moat and rampart.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Norbert Kaiser
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: 47.6265, 9.5991