The remains of the Castle can be visited
Surcasti Castle (Ruin)

The Surcasti ruin, a former hilltop castle, stands on a rocky spur in the Swiss canton of Graubünden. It is now closely associated with the village church.
History+
The exact construction date of Surcasti Castle is not documented but is presumed to be in the early 12th century. Written mentions of the complex or the associated Sogn Luregn Church appear from 1345 onwards. The von Übercastel family, who emerged as episcopal vassals, is first mentioned around 1325. Their last male descendant died around 1425. In 1520, the castle's square keep was converted into the bell tower of the parish church, whose current late Gothic structure dates from between 1515 and 1520. Renovations in 1774 shaped the church's present appearance.
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: 46.7014, 9.1803