The megaliths found at Stonehenge are some of the most investigated and interesting found in Britain today but despite centuries of examination, excavation and theories there is one big question that still remains, what were it origins and how over thousands of years did this iconic place evolve?

In this two part series by the BBC a group of experts for the first time are taking a more hi-tech approach in order to unlock the secrets of Stonehenge. The new data discovered and supported by archaeological evidence throws a new light on how humans progressed over the last 10,000 years.