Bernegg Castle was built in the mid to late 13th century for the Freiherr von Calfreisen, though it was probably called Calfreisen Castle until the 15th century. A mention of Otto von Calfreisen in 1231 indicates that the family lived in the area before the castle was built. They may have lived in an earlier castle which was replaced in the mid 13th century or in the village. In 1259 and again in 1286 the Freiherr was mentioned in the castle. After the extinction of the Calfreisen family in the 14th century, the castle was acquired by the Unterwegen family. Hans von Underwegen was mentioned at the castle in 1386, though they may have acquired it earlier. In 1428 it was acquired by the Sprecher family, who changed the name to Bernegg. The castle then vanishes from the historical record until the mid 16th century when it was described as a ruin.
The castle ruin is located on a hill south of Calfreisen village. The palas is a rectangular building about 11 by 13 meters and four stories tall. The walls are 2.4–2 m thick at the base, tapering to 1.8 m on the upper levels. The ground floor probably served as the castle's cellar. The second story has several small arrow slits in the walls. One of the arrow slits on the south wall was expanded into a door way which now serves as the entrance into the castle. The original high entrance on the third story south wall is still intact. The remains of a brick oven can be seen on the fourth story.
References:The Broch of Clickimin is a large and well preserved, though somewhat restored broch near Lerwick. Originally built on an island in Clickimin Loch (now increased in size by silting and drainage), it was approached by a stone causeway. The water-level in the loch was reduced in 1874, leaving the broch high and dry. The broch is situated within a walled enclosure and, unusually for brochs, features a large 'blockhouse' between the opening in the enclosure and the broch itself. Another unusual feature is a stone slab featuring sculptured footprints, located in the causeway which approached the site. Situated across the loch is the Clickimin Leisure Centre.