The remains of the Castle can be visited
CastleRossens
Illens Castle (Rossens)

Illens Castle is a castle in the municipality of Rossens of the Canton of Fribourg in Switzerland. It is a Swiss heritage site of national significance.
The ruins of Illens castle stand on a rock wall above a loop of the Saane/Sarine river.
Source: swisscastles.ch
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Location: 46.7385, 7.1105