Stonehenge Altar Stone. Credit: Wikimedia Commons / Public Domain The massive Altar Stone at Stonehenge may have received some help from ancient glaciers on its long journey to southern England, but people still likely carried it much of the remaining distance, according to new research. The study, led by Anthony J. I. Clarke and published in the Journal of Quaternary Science, examined the possible origins and transport routes of the six-ton sandstone monument that sits at the center of Stonehenge.