An aerial view of Dunbeath Castle in Caithness. A castle was first built on the site in 1428 under the Earls of Caithness. In 1620, the castle passed to Clan Sinclair through marriage and was rebuilt into a four-storey tower house, forming the basis of the current structure. The castle was extensively remodelled in the subsequent years and was finally sold by Clan Sinclair, after 350 years of possession, to John Avery in 1945. It remains a private residence.