The dolmen at Kilclooney in County Donegal, which dates from around 3500 BC, is a superb example of a dolmen, or portal tomb, and is widely regarded as one of, if not the greatest, in Ireland. (A dolment is a megalithic buriel chamber that is also known as a portal tomb.) The Kilclooney dolmen is located 4 miles north of Ardara on a tiny hill. Leaving Ardara, take the R261 to Portnoo and Narin. After about 5 kilometres, you’ll come to a road bend where the route descends to Narin and Portnoo. You’ll notice a church on your right (St. Conal’s) and the Dolmen Centre on the other side of the bend.