The first document to mention the castle in Carovignot dates back to 1163. Since then, the fortress fell in the hands of several rulers, the Normans of Geoffrey III of Montescaglioso, the Swabians in 1194 and the Angevines in 1306. In 1382 it passed to the prince of Taranto Raimondo del Balzo Orsini who then bequeathed it to his wife, queen Maria of Enghien, countess of Lecce.
The present appearance of the castle is due to recontruction works carried out between 1300's and the 1400's on a previous building. The rare triangular plan features angular towers connected to each other by curtain walls. The whole upper level is slightly jutting, while the walls are thickly crenellated. The curvilinear tower further amplifies the impression of a military building and unveils the Senese influence of the architect Francesco di Giorgio Martini.
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.