carleton castle is a category b listed building of the 15th-century five-storey tower and barmakin, once held by the cathcarts of killochan that stands overlooking the village close to the games loup cliffs. the long abandoned tower ruins still stand, minus the parapet and a collapsed section of wall that has been partly rebuilt at some more recent stage with internal plastering applied that suggests a later use as a dwelling or store. at the back of the tower pigsties-type ruins survive that were still roofed in the 19th century according to os maps. this small tower had only one private apartment reached via a stair from a window in the great hall, the entry to the oblong tower itself being originally via a door at first floor level with a wooden ladder or stair. the six-foot-thick () wall at the entrance may have had a stair within it that gave access to the cellar, great hall and a probable kitchen level. in the south-east corner a wheel stair connected the hall to the cellar. a prominent feature on the side facing the farm is a garderobe or privy shute.