Bernegg Castle, Graubünden, Medieval castle ruin in Calfreisen, Switzerland

Bernegg Castle is a medieval ruin perched on a hill south of Calfreisen village. The rectangular stone tower features walls measuring approximately 11 by 13 meters, with several narrow openings designed for archers.

Built in the mid to late 13th century, the castle was probably called Calfreisen Castle until the 15th century. The Calfreisen family is documented from 1259 to 1286; after their extinction, the Unterwegen family held it, with Hans von Underwegen mentioned in 1386. In 1428 it passed to the Sprecher family, who renamed it Bernegg. By around 1550 it was already a ruin.

The structure served as a seat of power for the von Sprecher family, who shaped local authority in the region. The name Bernegg reflects the site's importance to regional governance and remains part of the local identity.

The tower interior is not accessible; the ruin is viewed from outside. The site lies on a slope at the southeastern edge of Calfreisen, separated from the hillside by a ditch. The ground floor is partly filled with rubble.

An arrow slit on the south wall was later enlarged into a doorway to allow visitor access to the ruins. This adaptation shows how the site was modified over time for different purposes.