From Cornwall to Orkney, stone circles are scattered throughout the length and breadth of the British Isles. Their history stretches more than 2 millennia, varying from the earlier huge stone circles such as Castlerigg, Avebury and the Ring of Brodgar to the smaller and more regional circles that emerged after c.2,000 BC. Their remains continue to attract great amounts of visitors right up to the present day.

To learn more about these extraordinary prehistoric structures, I'm chatting with Timothy Darvill OBE, a professor from the Department of Archaeology and Anthropology at Bournemouth University and the author of Prehistoric Britain.