The remains of the Castle can be visited
CastleErlach
Erguel Castle (Ruin) (Sonvilier)

The construction dates of the Château d'Erguël are not known. It seems true that in the 11th century, the d'Erguël (or d'Arguel) family, originally from Franche-Comté, settled in the castle to exercise the function of bailiff until 1264.
Source: swisscastles.ch
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Location: 47.1358, 6.9778