Kilcashel Stone Fort
Kilcashel Stone Fort is a double court cairn and National Monument located in County Mayo, Ireland, 800m (½ mile) southeast of Kilmovee. The last surviving member of three stone forts in the area, it's estimated to have been constructed between 2,500 and 500BC. Description. Kilcashel Stone Fort is in diameter; the stone wall is thick and in height. A souterrain is located inside, as well as a bullaun and the sites of two collapsed houses.