The remains of the Castle can be visited
Friberg Castle (Ruin) (Trun)

The Friberg ruin, a former castle complex, is in the municipality of Trun in the canton of Graubünden, Switzerland.
History+
The exact origins of Friberg Castle are not fully documented. It is presumed that it may have been built by bailiffs from Distentis. In 1249, the administrator Antonius der Carnisio is said to have handed over or sold the monastic castle to his brother Lanfrancus. Later, in 1327, Vogt Hugo von Werdenberg had to return the castle to the monastery after disputes. A court ruling from 1469 mentions the Fryberg estate in the parish of Trun, although it is unclear whether this referred to the castle or a farm. The time when the castle was abandoned is not recorded.
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: 46.7481, 9.0018