The dolmen tomb is made up of five upright stones and a large capstone, the bare frame of what was originally a chambered grave, covered with a cairn of stones (man-made pile of stones made for a purpose) and earth.
The big earthwork circle (an embankment made of earth) is a beautiful example of a henge monument (ring-shaped bank and ditch, with the ditch inside the bank), built in about 2700BC during the Neolithic period, which means it predates the Egyptian pyramids. This is one of the finest found anywhere in Britain and Ireland.