Ancient Britons built a huge circle using stones that had been dragged 180 miles from Wales 5,000 years ago. 500 years later, they introduced the mighty sarsen stones, creating the Stonehenge we know today. All these years later, questions still remain: who built it and why? Is it magical? A religious temple? A celestial clock? Was it built by druids? By Merlin? Hosts Clive Anderson and Mary-Ann Ochota are determined to get answers and reveal the hidden secrets of the stones.