The remains of the Castle can be visited
CastleThusis
Obertagstein Castle (Ruin) (Thusis)

The ruins of Obertagstein Castle, a high castle, are on a rock outcrop southwest of Thusis in the Swiss canton of Graubünden, situated at approximately 1141 meters above sea level.
History+
The exact construction date of Obertagstein Castle is not documented, but architectural features suggest it was built in the late 13th century. It was first mentioned in a document in 1322 as “Taxstein,” a name possibly referring to the presence of badgers (Latin: taxus) in the area.
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: 46.6850, 9.4277