Tolmin Castle was first mentioned in 1188, and its chapel of Saint Martin in 1194. The east and north towers appear to have formed the original core of the fortress; another two hexagonal towers were added later. The north tower had an extensive basement for the storage of provisions, which along with two wells and rainwater cisterns allowed for the withstanding of sieges.
The castle was held in fief by a long series of masters: the Patriarchate of Aquileia, the Counts of Gorizia, the city of Cividale del Friuli, the Venetian Republic, and finally the Habsburgs. It appears to have functioned as a dedicated fortress rather than a residence, and had no permanent civilian population in peacetime, only a large garrison; it also housed a prison. The structure was severely damaged in the earthquakes of 1348 and 1511, but was repaired each time. It was finally abandoned in 1651 by its last owners, the Coronnini family, for a new manor in Tolmin itself, though it remained sufficiently intact by 1713 to play a role in the great peasant revolt of that year. The castle is currently in ruins, though parts of it have been restored.
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.