Stone Henges

Stonehenge's are made up of 11 Dolerite Blue-stones. Those are the stones that are on the outside ring of stones.Prehistoric builders would use tree trunks until they got them onto rafts. The rafts then carries the trunks to where these builders needed it. Each of these stones  can weigh up to 4 tons. The Stonehenge's were believed to be created in parts by first the Neolithic agrarians and then by "native Britons descended
from the original builders." Stonehenge's were used as burial sites, and also for religious means such as celebrations. Scientists are still unsure of what the real purpose of Stonehenge's were, however now a days they are used as a tourist attraction.

http://www.history.com/topics/british-history/stonehenge