The remains of the Castle can be visited
CastleJaun
Jaun Castle (Ruin)

The Lordship of Bellegarde (Jaun) was an independent foundation in the mid-13th century by Richard of Corbières. The castle was destroyed in 1407 by the people of Thun and Frutigen, then partially rebuilt by the Counts of Gruyère (1482-1537).
Source: swisscastles.ch
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Location: 46.6117, 7.2817