Kilcashel Stone Fort is a double court cairn and National Monument located in County Mayo, Ireland.LocationKilcashel Stone Fort is located 800 m southest of Kilmovee.HistoryKilcashel Stone Fort was possibly constructed c. 2500–500 BC.DescriptionKilcashel Stone Fort is 30m in diameter; the stone wall is 5m thick and 3m in height. A souterrain is located inside. There is also a bullaun.