Oldest ancient sites in Ireland

Ireland's oldest sites are Neolithic tombs, and the dates on this list are for their first construction or first burials. Poulnabrone, a portal tomb on the limestone of the Burren, was in use from about 3800 BC; the passage tombs of Carrowmore in County Sligo are dated from about 3750 BC; the Mound of the Hostages gives the Hill of Tara a date of about 3200 BC. Newgrange, about 3100 BC, is older than the Giza pyramids. Dún Aonghasa on Inis Mór dates from a first enclosure of about 1100 BC, though its walls were rebuilt later.