Hopefully I've managed to shed a little light - as opposed to the horizontal rain which gave me a right good kicking - upon the confusion surrounding Dartmoor's 'Giant's Grave'. Basically a round barrow at SX76768744... not much to write home about, to be honest. However the large stone circle and kerbed cairn to south - plus an exquisite cairn circle to north - most certainly are. In my opinion one of Dartmoor's major sites, Mardon Hill.