Overview: Stonehenge is a marvel of prehistoric architecture. For centuries, archaeologists have been piecing together its history and its meaning, but the reason for its location in a remote corner of England remains one of its biggest mysteries. Now, after years of investigation, a team of experts has discovered an ancient mass grave at the Stonehenge site, a revelation that is overturning and reshaping the 5,000 year history of this massive edifice. Join us as we reveal new secrets about the world's most famous surviving monument from the Stone Age.