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BBC News
By Chris Wood
image copyrightSteven Tasker
image captionHow Steven believes the machine could have looked - with the stone held over a circular board in the middle and wooden planks pulled sideways to propel the feet forward
It is a mystery that has confounded experts for centuries - how were huge stones transported 180 miles (290km) from the Preseli Hills to Stonehenge?
However, a Denbighshire man believes it was a long-forgotten machine which appeared to defy gravity and was even possibly referenced in the Bible.
A leading expert said his theory was as good as any, and better than most .