The remains of the Castle can be visited
CastleBretzwil
Ramstein Castle (Ruin)

The Ramstein ruin is located about 700 meters south of the village of Bretzwil on a mighty rock outcrop, a northern spur of the Aletenchopf. In its immediate vicinity, 250 m east of the ruin, lies the Ramstein Castle Farm, which is still in operation today.
Source: swisscastles.ch
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Location: 47.3903, 7.6542