Jerez de los Caballeros Castle dates back to the 13th century. The castle stands on the western part of a hill, around which the town of the same name extends. Since the Neolithic it was inhabited by Phoenicians, Celtic Betures, who were initially known as 'Ugultiniacum', Romans, Visigoths, Muslims and chivalric orders such as the Temple and Santiago settled chronologically in these territories.
The current castle was built by the Templars, who refused to lay down arms when the order was suppressed, and came to a sticky end. You can wander around at will, but it's basically just the impressive walls that are preserved, with pretty gardens dotted around.
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.