The remains of the Castle can be visited
CastleHohentannen
Alt-Heidelberg Castle (Ruin) (Hohentannen)

While a Wezilo de Haidoltsberg is mentioned in a document in 1137, Heidelberg Castle was only built around 1210/20 and destroyed in the Appenzell Wars in 1403.
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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: 47.5021, 9.2219