The Stonehenge Hidden Landscape Project team says it has made the discovery beneath Durrington Walls, also known as “superhenge” — one of the largest known henge monuments built about a century after Stonehenge, which is believed to have been completed 3,500 years ago.

“Our high-resolution ground penetrating radar data has revealed an amazing row of up to 90 standing stones, a number of which have survived after being pushed over, and a massive bank placed over the stones,” said professor Wolfgang Neubauer, director of the Ludwig Boltzmann Institute for Archaeological Prospection and Virtual Archaeology.

“In the east up to 30 stones, measuring up to size of 4.5 x 1.5 x 1 meters (14.7 x 5 x 3.3 feet), have survived below the bank whereas elsewhere the stones are fragmentary or represented by massive foundation pits,” he added.