Somber, still, and timeworn, Stonehenge looms large in humanity's mythos – an ancient, enigmatic monument that has stood sentinel over southern England for millennia.

Somber, still, and timeworn, Stonehenge looms large in humanity's mythos – an ancient, enigmatic monument that has stood sentinel over southern England for millennia.

A groundbreaking study suggests that Stonehenge's Altar Stone, previously thought to have been moved solely by human effort, may have been aided by glacial transport from Scotland…