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Archaeologists think the discover marks “a new chapter” in Stonehenge’s story.
They surround the ancient settlement of Durrington Walls, two miles (3km) from Stonehenge.
Tests recommend the ground works are Neolithic and were excavated more than 4,500 years ago.
A group of academics from the universities of St Andrews, Birmingham, Warwick, Glasgow and the University of Wales Trinity Saint David worked on the project