Grianan an Aileach at the top of the hill is the ancient Temple of the Sun christianised by St. Patrick. Founded by the Druids, this ring fort dates back to some 2000 years B.C. . The panoramic view from the walls of this ancient palace is truly magnificent, 7 counties can be seen on a clear day. The legends and history behind Grianan is interpreted at the Grianan Aileach Centre, 2km from the fort.