The remains of the Castle can be visited
CastleFrutigen
Bürg Castle (Ruin) (Frutigen)

Above the village of Frutigen in the canton of Bern, Switzerland, lies the Ruine Bürg, a former medieval residential tower. This 13th-century complex was once the ancestral seat of the Knights of Frutigen.
History+
The Bürg Castle was built in the 13th century as a residential tower and served as the ancestral seat for the Knights of Frutigen, who were vassals of the Imperial Bailiffs of Kien. The tower maintained visual contact with the surrounding Chutzen and Tellenburg. Two moats protected the complex from two sides.
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: 46.5969, 7.6333