Stonehenge glacier theory. Illustration showing an alternate theory for how the stones of Stonehenge arrived at their present location. Some geologists believe that glaciers, not humans, carried the massive stones long distances to where Stonehenge was constructed by humans. Stonehenge is a prehistoric circle of standing stones located in Wiltshire, UK. It dates from 3000 BC to 2000 BC, with different construction phases in that period. Theories about its function range from astronomical observatory to religious site.