Overton Hill marks the southern end of The Ridgeway, an ancient track that runs northeast across the North Wessex Downs and the Chilterns. It also marks what would have been the start of the West Kennet Avenue, the double stone row that leads into Avebury. During the late Neolithic and at about the same time as work was taking place on the Avebury earthwork, some kind of timber structure was constructed on this hill. It consisted of 6 concentric rings of timber posts - these could have been free standing, perhaps painted and carved or formed some kind of building. At some later point in time a double ring of low sarsen stones were added outside this timber structure, the outer ring having a diameter of around 40 metres.
The site was recorded and drawn by William Stukeley shortly before it was destroyed for agriculture in the 1720's and lay undisturbed until it was rediscovered by Maud Cunnington in 1930. All that remains on this enigmatic hill today are concrete markers showing the former positions of the circles.