Altar stone (Stonehenge)
From Wikipedia, the free encyclopedia
The Altar stone is a central megalith at Stonehenge in England, dating to Stonehenge phase 3i, around 2600 BC. It is made of green micaceous sandstone and originated from a quarry in Wales. It weighs six-tons and would have been twice the height of the bluestones at the site. Now recumbent, it may have stood as a single large monolith.