Cromwell’s Barracks on Inishbofin Island is a striking 17th-century fortress. Built by Oliver Cromwell’s forces around 1656, it served as a strategic military stronghold and later as a prison for Catholic clergy during Cromwell’s campaign in Ireland. Located at the entrance to the island’s harbour, its imposing stone walls still stand as a reminder of its storied history. You can explore the ruins by taking a 30-minute ferry trip from Cleggan Pier. Cleggan Pier is approximately a 40-minute drive from Ballynahinch Castle.