OPW Heritage Ireland places in County Mayo

A round tower of the 11th or 12th century and a late medieval church on Tóchar Phádraig, the pilgrim road to Croagh Patrick, in the village of Aghagower near Westport; free, open in daylight.

The world's most extensive Stone Age monument, six-thousand-year-old field walls under the north Mayo bog, with OPW's pyramid visitor centre, immersive film, cliff viewing platform and boardwalk; open mid March to early November, cafe.

A small medieval church on Clare Island in Clew Bay with Ireland's finest surviving medieval roof paintings and the tomb of the O'Malleys, reached by ferry from Roonagh Pier; free, interior by caretaker or key.

A Dominican friary founded in 1274 on the shore of Rathfran Bay north of Killala, burned in 1590, with a crucifixion panel over the west door and lancet windows, reached by a shore path; free, open-air.

One of Ireland's best preserved Franciscan friaries, founded in the 1440s on the shore of Killala Bay at the mouth of the Moy and burned in 1590, with a central tower, traceried gables and upper floors to climb; free, open-air.