The remains of the fortress can be visited
Hohentwiel Castle

On a volcanic cone in the Hegau region, near Lake Constance, lies the fortress ruin Hohentwiel. As one of Germany's largest castle ruins, it attracts numerous visitors annually.
History+
The first mention of fortifications on the Hohentwiel dates back to 915. In the early Middle Ages, the site served as a ducal seat and was owned by various noble families, including the Zähringer and Klingenberger. By the early 16th century, Hohentwiel increasingly fell under the influence of Württemberg and once again became a ducal residence. In the following centuries, it was expanded into a Württemberg state fortress. During the Thirty Years' War, the fortress withstood five sieges. After this period, it served as a state prison until it was razed in 1801 during the Second Coalition War. Despite its destruction, the ruin quickly became a destination for travelers.
Location+
The fortress ruin Hohentwiel is located at an altitude of approximately 638 m above sea level in Singen, in the district of Konstanz, Baden-Württemberg, Germany.
On site+
Today, the fortress ruin Hohentwiel is accessible to visitors and can be explored. It provides a backdrop for cultural events.
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Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://schloesserrundschau.de/bawue/schloesser/konstanz05.html
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: 47.7645, 8.8174