It has long been speculated the huge man-made structure in Wiltshire was an ornate grave or a ceremonial hilltop for religious rituals . But expert claims mound was built as lighthouse and harbour to help Neolithic traders navigate post-glacial waterways . The discovery of the site is significant because it shows how early people used sophisticated technology - including metal tools - to build large structures on top of hills that were once covered by ice sheets, said
It has long been speculated the huge man-made structure in Wiltshire was an ornate grave or a ceremonial hilltop for religious rituals . But expert claims mound was built as lighthouse and harbour to help Neolithic traders navigate post-glacial waterways . Believes southern Britain was a series of islands linked by waterways , channels and swollen rivers , and that Stonehenge was located on coast .