A row of huge stones stood some 4,000 years ago just two miles from Stonehenge, dwarfing the iconic stone circle.
Dubbed "Superhenge," the site is five times bigger than the iconic stone circle and lies buried three feet beneath a thick, grassy bank at a Stone-Age enclosure known as Durrington Walls.
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"We're looking at one of the largest stone monuments in Europe and it has been under our noses for something like 4,000 years," Vince Gaffney, chair in Landscape Archaeology and Geomatics at the University of Birmingham, said.
"We don't think there's anything quite like this anywhere else in the world. This is completely new and the scale is extraordinary," he said.
Gaffney announced the finding at the opening of the ongoing British Science Festival.
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Image: Artist reconstruction of the standing stones at Durrington Walls.