Set jewel-like in a languid green valley bounded by rolling hills, the jagged ruins of this Cistercian abbey are breathtaking. Donal Mór O’Brien founded the abbey in 1194, and his grandson, a former king of Thomond, is entombed in the structure’s northern wall. Some interesting medieval and Romanesque carvings are set in the stone, including one of a bishop with a crosier. Corcomroe is a lonely spot, except for Easter morning, when people come from miles around to celebrate Mass. It’s said to be quite a sight. Look for a mound, surrounded by trees, beside the road on the way out—it’s the remains of an ancient ring fort.