Stonehenge is one of the most famous monuments in the world. The outline of the trilithons, the great gate-like constructions that form its outer ring, are enough to identify it. They appear on T-shirts, badges and even, in the English Heritage gift shop, as earrings.

Yet Stonehenge remains mysterious. The British Museum’s new exhibition, The World of Stonehenge (February 17 to July 17) considers the advances in archaeological techniques, carbon dating and probability theory that have helped the modern age to understand it better.