Origin of Stonehenge standing stones finally revealed

As solving mysteries go – this one is pretty special.

More than 50 years ago a businessman was given a piece of one of Stonehenge’s famous sarsen stones, after part of the core was removed during repair work.

It went with him when he emigrated to the United States.

Now, half a century later it has been returned and researchers have used it to solve one of the ancient world’s biggest secrets – where the sarsen stones actually come from.