Castle Sinclair Girnigoe was originally a late 15th century stone enclosure castle, with a keep-gatehouse, founded by the Sinclair Earls of Caithness. Standing on a promontory and defended by a deep ditch, is a late 16th century, five storey L-plan tower house, with the earlier West Gatehouse of the enclosure castle. Visit pending. 6 miles north is Keiss Castle.