The monument has baffled archaeologists who have argued for decades over the stone circle's 5,000-year history but academic Rupert Till believes he has solved the riddle by suggesting it may have been used for ancient raves.

Mr Till, an expert in acoustics and music technology at Huddersfield University, West Yorks., believes the standing stones had the ideal acoustics to amplify a "repetitive trance rhythm".

The original Stonehenge probably had a "very pleasant, almost concert-like acoustic" that our ancestors slowly perfected over many generations

Because Stonehenge itself is partially collapsed, Dr Till, from York, North Yorks., used a computer model to conduct experiments in sound.