Stonehenge Stonehenge Stonehenge is a prehistoric monument in Wiltshire, England, west of Amesbury. It consists of a ring of standing stones, with each standing stone around high, wide and weighing around 25 tons. The stones are set within earthworks in the middle of the most dense complex of Neolithic and Bronze Age monuments in England, including several hundred burial mounds. Archaeologists believe it was constructed from 3000 BC to 2000 BC. The surrounding circular earth bank and ditch, which constitute the earliest phase of the monument, have been dated to about 3100 BC. Radiocarbon dating suggests that the first bluestones were
Altar Stone (Stonehenge) Altar Stone (Stonehenge) The Altar Stone is a recumbent central megalith at Stonehenge in England, dating to Stonehenge phase 3i, around 2600 BC. It is made of a purplish-green micaceous sandstone and is thought to have originated from outcrops of the Senni Beds formation of the Old Red Sandstone in Wales, though this is currently in debate. Stone 80 (Altar Stone) was most recently excavated in the 1950s, but no written records of the excavation survive, and there are no samples available for examination that are established as having come from the monolith. Stone 55 (a sarsen megalith) lies on