A major prehistoric discovery has been confirmed near Stonehenge: a ring of enormous Neolithic pits at Durrington Walls in Wiltshire. New research shows these pits—each about 10m wide and over 5m deep—form a vast, deliberately planned structure more than 4,000 years old. Archaeologists say the pits are arranged with remarkable accuracy, suggesting ancient builders measured and counted carefully to align them with nearby monuments like Woodhenge and an earlier enclosure.

Published in Internet Archaeology, the study concludes the pits are unquestionably man-made. Researchers used geophysical surveys and drilled narrow boreholes to extract sediment, which contained animal remains and provided dating evidence. Luminescence tests revealed the pits were not only dug in the Neolithic period but remained open for roughly a thousand years.

Professor Vince Gaffney describes the site as potentially the largest prehistoric structure discovered in Britain—an immense, horseshoe-shaped boundary that may reflect the belief systems of the people who created it. Scientists say the scale of the construction, cut deep into chalk, shows extraordinary communal effort and hints at complex cultural practices within the Stonehenge landscape.