The remains of the Castle can be visited
CastleSchwarzenburg
Grasburg Castle (Ruin) (Schwarzenburg)
As the largest ruin in the Canton of Bern, but also due to its location on a sandstone cliff steeply falling to the Sense river, Grasburg has long been a destination for recreational excursionists and groups of students and scouts eager for suitable "robber" playgrounds.
Source: swisscastles.ch
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Location: 46.8339, 7.3316