Stonehenge 'may have been giant musical instrument'
6 March 2014 Last updated at 11:32 GMT
Stonehenge may have been used as a giant musical instrument, according to a study.
Researchers from the Royal College of Art discovered that the central Blue Stones, which originated in South Wales, had musical tones when struck.
The theory could explain why the stones were arranged in a circle - so the sound would resonate.
Paul Devereux, who part led the study, told BBC Radio 5 live's Drive: "We do know such rocks were deemed very important in other parts of the ancient world."