Archaeologists working at Stonehenge are said to be “astonished” after discovering the largest prehistoric structure ever found in Britain, a circle of deep underground passages, dating back some 4,500 years.

The same Neolithic people behind the mysterious Stonehenge monument, which continues to baffle scientists and archaeologists alike to this day, also dug a circle of radially aligned tunnels spanning 1.2 miles (1.93 km) in diameter. They encircle Durrington Walls, one of Britain's largest henge monuments, which is located precisely in the center.

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That whole area needs to be gone over with GPR and lidR.