The Stonehenge Hidden Landscapes Project, is a four-year collaboration between a British team and the Ludwig Boltzmann Institute for Archaeological Prospection and Virtual Archaeology in Austria that has produced the first detailed underground survey of the area surrounding Stonehenge, totaling more than four square miles. The results are astonishing. The researchers have found buried evidence of more than 15 previously unknown or poorly understood late Neolithic monuments: henges, barrows, segmented ditches, pits.
smithsonianmag.com/history/what-lies-beneath-Stonehenge-180952437/?page=1&no-ist
