Keiss Castle is a late 16th or early 17th century stone Z-plan tower house, founded by the Earls of Caithness. Standing against the sea cliff, the rectangular main block is of four storeys and an attic, the basement is vaulted and at opposite corners are round towers. Erosion has collapsed the north-east angle of the tower, which contained the entrance and the upper floors are missing. The castle was an abandoned ruin, when new Keiss Castle was built in the mid 18th century. 6 miles south is Castle Sinclair Girnigoe and 12 miles north is Castle of Mey.