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A TEAM of experts led by the University of Bradford has discovered what could be one of the largest prehistoric sites in the UK on the doorstep of Stonehenge.

The 4,500-year-old previously-unknown structure is 2km across and it is thought the circular feature and a post line could have guided people towards the religious sites and warned others not to cross the boundary.

The archaeologists found the ring of prehistoric pits up to 10m across and 5m deep surrounding the ‘super henge’ at Durrington Walls and the famous site at Woodhenge.

The structures have been carbon dated to about 2500BC and archaeologists believe the circle marks a boundary around the massive henge at Durrington.

Stonehenge, which was constructed between 3000 and 2500BC, is set within a huge ceremonial landscape that staff at the University of Bradford have been investigating for decades.