The remains of the castle can be visited
Ruchenstein Castle

The Ruchenstein castle ruin, a structure in the canton of Aargau in Switzerland, sits atop a hill. Its remains today offer insight into regional history.
History+
Ruchenstein Castle was built in 1262, on the same hill as the neighboring Kasteln Castle. Two years later, in 1264, the Habsburgs assumed sovereignty after the Kyburg dynasty died out. In 1311, the Lords of Mülinen acquired the village and both castles, forming the small lordship of Kasteln. Even after the city of Bern conquered the Schenkenbergertal in 1460, the Lords of Mülinen retained their rights, including lower jurisdiction.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Adrian Michael / CC BY 4.0 via Wikimedia Commons
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 47.4417, 8.1176