Prehistoric enclosure, over 200 metres in diameter, with a dolmen in the centre.

The big earthwork circle, roughly 200m across, is a beautiful example of a 'henge' monument, built in about 2700BC during the Neolithic period. Similar monuments are found elsewhere in Britain and Ireland, but this is one of the finest. In the middle is a tomb made up of 5 upright stones and a large capstone, the bare frame of what was originally a chambered grave, covered with a cairn of stones and earth.