'Durrington Walls may have had 200 stones, Stonehenge only had about 90'

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For five years archaeologists have been compiling an underground map of the area around Stonehenge: and they've discovered something remarkable. Not far away is a circular enclosure known as Durrington Walls - the circumference is bigger than Stonehenge itself - but it's what's underneath that is causing the excitement. The team have discovered more than a hundred stone monoliths underground, which seem to have been pushed over and buried - and they're discovering more stones all the time. Professor Vincent Gaffney of Bradford University is one of the lead archaeologists on the project.