By Mike Pitts

Icon of the New Stone Age, sculptural and engineering marvel, symbol of national pride: there is nothing quite like Stonehenge. These great sarsen and bluestone slabs, arranged with simple, graphic genius, attract visitors from across the world. The monument stands silent in the face of the questions its unlikely existence raises: who built it? Why? How?

There has been endless speculation about why Stonehenge was built, inspiring theories ranging from the academically credible to the improbable, but far less investigation into how. In the millennia since its creation, pieces of Stonehenge have been knocked over by heavy machinery, found their way to Florida (and back again), and been exposed to radioactive sodium, but the seemingly impossible endeavour of raising the stones with Neolithic technology has remained inexplicable - until now.