Stonehenge is a Neolithic and Bronze Age megalithic monument located near Amesbury in the English county of Wiltshire, about 8 miles (13 km) north of Salisbury. It is composed of earthworks surrounding a circular setting of large standing stones and is one of the most famous prehistoric sites in the world. Archaeologists think the standing stones were erected between 2500 BC and 2000 BC although the surrounding circular earth bank and ditch, which constitute the earliest phase of the monument, have been dated to about 3100 BC. The site and its surroundings were added to the UNESCO's list of World Heritage Sites in 1986 in a co-listing with Avebury henge monument, and it is also a legally protected Scheduled Ancient Monument. Stonehenge itself is owned and managed by English Heritage whilst the surrounding downland is owned by the National Trust.
Many early historians were influenced by supernatural folktales in their explanations. Some legends held that Merlin the wizard had a giant build the structure for him or that he had magically transported it from Mount Killaraus in Ireland, while others held the Devil responsible. Henry of Huntingdon was the first to write of the monument around 1130 soon followed by Geoffrey of Monmouth who was the first to record fanciful associations with King Arthur, which led the monument to be incorporated into the wider cycle of European medieval romance.
Stonehenge is aligned north east — south west, and it has been suggested that particular significance was placed by its builders on the solstice and equinox points, so for example on a midsummer's morning, the sun rose close to the Heelstone, and the sun's first rays went directly into the centre of the monument between the horseshoe arrangement. It is unlikely that such an alignment can have been merely accidental.
By the beginning of the 20th century a number of the stones had fallen or were leaning precariously, probably due to the increase in curious visitors clambering on them during the nineteenth century. Three phases of conservation work were undertaken which righted some unstable or fallen stones and carefully replaced them in their original positions using information from antiquarian drawings.
Stonehenge is a place of pilgrimage for neo-druids and those following pagan or neo-pagan beliefs.
The earlier rituals were augmented by the Stonehenge free festival, held between 1972 and 1984, and loosely organised by the Politantric Circle. However, in 1985 the site was closed to festivalgoers by English Heritage, and the National Trust by which time the number of midsummer visitors had risen from 500 to 30,000. A consequence of the end of the festival was the violent confrontation between the police and new age travellers that became known as the Battle of the Beanfield when police blockaded a convoy of travellers to prevent them from approaching Stonehenge. There was then no midsummer access for almost fifteen years until limited opening was negotiated in 2000.
There is a full-size replica of Stonehenge as it would have been before decay at Maryhill in Washington State, built by Sam Hill as a war memorial. Stonehenge Aotearoa in the Wairarapa region of New Zealand is a modern adaptation aligned with the astronomy seen from the Antipodes; it was built by the Phoenix Astronomical Society from wood and sprayed concrete. The University of Missouri at Rolla has a half-scale replica located on campus, UMR Stonehenge, built from solid granite.
Carhenge was constructed from vintage American cars near Alliance, Nebraska by the artist Jim Reynolds in 1987. Another replica, called Stonehenge II, in Texas is constructed from an adobe-like material. Tankhenge existed in the border zone of Berlin in the early 1990s after the collapse of the Wall. Tankhenge was constructed from three ex-Soviet armoured personnel carriers.
A full-size Stonehenge made out of foam, and inevitably called Foamhenge, stands near Natural Bridge, Virginia.
Aside from modern replicas, several other archaeological sites have had Stonehenge's name partially or fully incorporated into their own names. America's Stonehenge is an unusual and controversial site in New Hampshire.
A henge near Stonehenge containing concentric rings of postholes for standing timbers, discovered in 1922, was named Woodhenge by its excavators because of similarities with Stonehenge. The timber Seahenge in Norfolk was named as such by journalists writing about its discovery in 1998.
In May 2006, reports emerged of an "Amazon Stonehenge" Calcoene, 390 kilometres from Macapa, the capital of Amapa state, near Brazil's border with French Guyana. It is comprised of 127 stones, possibly forming astronomical observing points.
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