[1] Felsenburg castle was probably built in the 12th century for the Freiherr of Kien.

The castle was built on a rocky spire above the road over the Gemmi pass into Valais.

It was inherited, along with the rest of the Herrschaft of Frutigen, by the Freiherr of Wädenswil in 1290.

In 1400, Bern acquired the castle along with the rest of the Herrschaft.

[2] Currently, only the rectangular main tower and remnants of the outer walls are still standing.