The Spring equinox falls on 20th March. A few dozen pagans and Druids will mark it with ceremonies inside the famous circle at Stonehenge. The summer solstice in June, on the other hand, will see thousands of people converge on the site. Why do they come? To connect with the ancestors? Celebrate nature? Rave? Does what they do bear any relationship to what happened at Stonehenge thousands of years ago, and can we ever know? Ernie Rea is joined by Ronald Hutton, Professor of History at the University of Bristol, Julian Thomas,. Professor of archaeology at Manchester University and Frank Somers from the Amesbury and Stonehenge Druids.