The remains of the Castle can be visited
CastleZweisimmen
Mannenberg Castle (Ruin) (Zweisimmen)

Little more is known about the history of the lower Mannenberg Castle than about the upper castle. The entire hill formed the high medieval center of power in the Obersimmental, which in the 10th century came to Emperor Otto III as originally Burgundian crown property.
Source: swisscastles.ch
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Location: 46.5701, 7.3794