To be privately owned
Gottlieben Castle

Gottlieben Castle, a former moated castle originally equipped with two towers, stands at the eastern edge of the municipality of Gottlieben, directly on the banks of the Seerhein in the Canton of Thurgau.
History+
The castle's origins date back to 1251, when the Bishop of Constance, Eberhard II, had the complex built along with a wooden bridge over the Rhine. His aim was to rival the city of Constance, with which he was in conflict. The moated castle was expanded; a palace was added in 1346, though partly destroyed between 1352 and 1355, as well as an east wing (1434–1446) and a north wing (1475–1491). The castle played a role during the Council of Constance, serving as a prison for figures such as the reformer Jan Hus, Jerome of Prague, and Pope John XXIII.
Source: Wikipedia · Licence: CC BY-SA 4.0
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: 47.6639, 9.1361