Stonehenge is a prehistoric monument located in the English county of Wiltshir, about 3.2 kilometres (2.0 mi) west of Amesbury and 13 kilometres (8.1 mi) north of Salisbury. One of the most famous sites in the world, Stonehenge is composed of earthworks surrounding a circular setting of large standing stones and sits at the centre of the densest complex of Neolithic and Bronze Age monuments in England, including several hundred burial mounds. Some stones still stand straight up. But other lie on the ground where they fell hundred of years ago and some of the stone pillars still stand, just as they did 4,000 years ago. Stonehenge began as a large, circular ditch, built about 1900 B.C. This ditch is about 300 feet in diameter. Two hundred years later, the ring of bluestones was built. It was near the center of the ditch and mound. A hundred years or more went by before the large stone pillars were added. Thus, at least 300 years were required to complete the mystery of Stonehenge.
