The oldest part of the present castle — a U-shaped tower in the southern corner — dates from the 13th or 14th century. Referred to by most authors as a keep, it was built onto the bare rock and provided the first residential quarters. The south west Schlossturm Tower dates from the 15th century as do part of the west curtain wall and the south curtain wall. In the north, the great hall of 1552, on the probable site of the former lower courtyard, is flanked by two large artillery towers; the north east tower dated 1515 carries the arms of Hans Jacob de Morimont and his wife Margarete de Furtenberg. In the south, there was a second residence of which a staircase tower remains. The castle entrance was defended by a low casemated tower and a barbican. In the middle of the west wall is a tower with wells.