The most characteristic and outstanding site of Hornachos is its castle built on the top of the hill by the Arabs during the Al-Andalus period in the 9th century. In 1234 Hornachos was occupied by the Order of Santiago, as a land grant by Ferdinand III of Castile. Today only a few traces remain.
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.