Perched on a small island in Lough Corrib, Castlekirk Castle is one of Ireland’s oldest Norman castles, with a rich history linked to the fierce O’Flaherty clan and the legendary Gráinne Mhaol, Ireland’s famous pirate queen. Originally built in the 12th century and later reinforced by the O’Flahertys, this remote stronghold played a key role in defending the region. Though now in ruins, the castle remains a fascinating site for history lovers. Accessible only by boat, visitors can kayak or take a guided tour across Lough Corrib to experience this hidden gem up close.