Howth is an Irish village on the Howth Peninsula, east of central Dublin. The grounds of 15th-century Howth Castle have rhododendron gardens and a transport museum with local trams. The 19th-century Martello Tower houses a vintage radio museum. The medieval ruins of St. Mary’s Abbey lie nearby. A clifftop trail has sweeping sea views. Offshore, Ireland’s Eye is an island bird sanctuary with an ancient ruined church.