It discovered a prehistoric circular monument of Stonehenge ten times higher than. The archaeological site is almost 4000 years old.British archaeologists have started unearthing hidden mysteries major excavation of a prehistoric circular monument hidden below ground, about ten times larger than Stonehenge.Marden called Heng, prehistoric structure of 4000 years old, in Wiltshire, covering a total area of 10.5 hectares, the equivalent of ten fields fotbail, the largest of the United Kingdom.English Heritage has already conducted two years of polling activities and topography in the hope of identifying secrets behind the monument as he put the jar on among historians for centuries. GO TO TOP^