The largest Altar Stone at the heart of Stonehenge is actually Scottish not Welsh, research suggests.The "remarkable" discovery has left experts "stunned" and busts a century-long held belief about the origins of the bluestone at the centre of the prehistoric monument.

The largest Altar Stone at the heart of Stonehenge is actually Scottish not Welsh, research suggests.The "remarkable" discovery has left experts "stunned" and busts a century-long held belief about the origins of the bluestone at the centre of the prehistoric monument.