When this tower house was built during the late 15th century, its massive stone exterior provided defense while the interior served as a luxurious residence for the O’Donoghue Mór clan, a family from Cork dating back to Ireland’s 10th century. Apparently the chieftain drowned in Lough Leane (seen in the background) yet returns every seven years for a gallop around the lake. The medieval castle was owned by several families before becoming a military barracks. The stronghold is available for guided tours as part of the Killarney National Park.