OPW Heritage Ireland places in County Wexford

A five-storey tower house of about 1450, probably built by the Knights Hospitallers, high above the Waterford Estuary at Ballyhack; free, open in a short summer season, closed until 2027.

Half of William Marshal's castle of about 1200 survives in Ferns, with a circular chapel in its best tower and a community tapestry in the visitor centre; free tours in summer, closed until 2027.

OPW's 252-hectare memorial arboretum on Slieve Coillte near New Ross: 4,500 kinds of tree, a lake, a JFK exhibition and a hilltop viewpoint, open all year; adult €5, free for English Heritage members, dogs on leads.

William Marshal's Cistercian abbey of about 1200 at Saltmills, later the Colclough family home, with the Tintern Trails through Coillte woods, open March to early November; adult €5 cash only, free for English Heritage members.