Stonehenge is a prehistoric megalithic structure on Salisbury Plain in Wiltshire, England, two miles (3 km) west of Amesbury. It consists of an outer ring of vertical sarsen standing stones, each around 13 feet (4.0 m) high, seven feet (2.1 m) wide, and weighing around 25 tons, topped by connecting horizontal lintel stones which are held in place with mortise and tenon joints—a feature unique among contemporary monuments. Inside is a ring of smaller bluestones. Inside these are free-standing trilithons: two bulkier vertical sarsens joined by a single lintel. The whole monument, now in ruins, is aligned towards the sunrise on the summer solstice and sunset on the winter solstice. The stones are set within earthworks in the middle of the densest complex of Neolithic and Bronze Age monuments in England, including several hundred tumuli (burial mounds).
Stonehenge was constructed in several phases, beginning about 3100 BC and continuing until about 1600 BC. The famous circle of large sarsen stones was placed between 2600 BC and 2400 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 bluestones were given their current positions between 2400 and 2200 BC, although they may have been at the site as early as 3000 BC.
One of the most famous landmarks in the United Kingdom, Stonehenge is regarded as a British cultural icon. It has been a legally protected scheduled monument since the Ancient Monuments Protection Act 1882 was passed. The site and its surroundings were added to UNESCO's list of World Heritage Sites in 1986. Stonehenge is owned by the Crown Estate and managed by English Heritage; the surrounding land is owned by the National Trust.
Stonehenge could have been a burial ground from its earliest beginnings. Deposits containing human bone date from as early as 3000 BC, when the ditch and bank were first dug, and continued for at least another 500 years.
Etymology
The Oxford English Dictionary cites Ælfric's 10th-century glossary, in which henge-cliff is given the meaning 'precipice', or stone; thus, the stanenges or Stanheng "not far from Salisbury" recorded by 11th-century writers are "stones supported in the air". In 1740, William Stukeley notes: "Pendulous rocks are now called henges in Yorkshire ... I doubt not, Stonehenge in Saxon signifies the hanging stones." Christopher Chippindale's Stonehenge Complete gives the derivation of the name Stonehenge as coming from the Old English words stān 'stone', and either hencg 'hinge' (because the stone lintels hinge on the upright stones) or hen(c)en 'to hang' or 'gallows' or 'instrument of torture' (though elsewhere in his book, Chippindale cites the 'suspended stones' etymology).
The "henge" portion has given its name to a class of monuments known as henges. Archaeologists define henges as earthworks consisting of a circular banked enclosure with an internal ditch. As often happens in archaeological terminology, this is a holdover from antiquarian use.
Early history
Mike Parker Pearson, leader of the Stonehenge Riverside Project based around Durrington Walls, noted that Stonehenge appears to have been associated with burial from the earliest period of its existence:
Stonehenge was a place of burial from its beginning to its zenith in the mid third [sic] millennium B.C. The cremation burial dating to Stonehenge's sarsen stones phase is probably just one of many from this later period of the monument's use and demonstrates that it was still very much a domain of the dead.
Stonehenge evolved in several construction phases spanning at least 1500 years. There is evidence of large-scale construction on and around the monument, perhaps extending the landscape's time frame to 6500 years. Dating and understanding the various phases of activity are complicated by disturbance of the natural chalk by periglacial effects and animal burrowing, poor quality early excavation records, and a lack of accurate, scientifically verified dates. The modern phasing most generally agreed to by archaeologists is detailed below. Features mentioned in the text are numbered and shown on the plan, right.
Before the monument (from 8000 BC)
Archaeologists have found four, or possibly five, large Mesolithic postholes (one may have been a natural tree throw), which date to around 8000 BC, beneath the site of the tourist car park that was in use until 2013. These held pine posts around two feet six inches (0.75 m) in diameter, which were erected and eventually rotted in place. Three of the posts (and possibly four) were aligned east–west, which may have had ritual significance. Another Mesolithic astronomical site in Britain is Warren Field in Aberdeenshire, which is considered the world's oldest lunisolar calendar, corrected yearly by observing the midwinter solstice. Similar but later sites have been found in Scandinavia. A settlement that may have been contemporaneous with the posts has been found at Blick Mead, a reliable year-round spring one mile (1.6 km) from Stonehenge.
Salisbury Plain was still wooded, but 4,000 years later, during the earlier Neolithic, people built a causewayed enclosure at Robin Hood's Ball and long barrow tombs in the surrounding landscape. In approximately 3500 BC, a Stonehenge Cursus was built 2,300 feet (700 m) north of the site as the first farmers began clearing the trees and developing the area. Other previously overlooked stone or wooden structures and burial mounds may date as far back as 4000 BC; charcoal from the Blick Mead camp has been dated to that time. The University of Buckingham's Humanities Research Institute believes that the community who built Stonehenge lived there for several millennia, making it potentially "one of the pivotal places in the history of the Stonehenge landscape."
Stonehenge 1 (c. 3100 BC)
The first monument consisted of a circular bank and ditch enclosure made of Late Cretaceous (Santonian Age) Seaford chalk, measuring about 360 feet (110 m) in diameter, with a large entrance to the north east and a smaller one to the south. It stood in open grassland on a slightly sloping spot. The builders placed the bones of deer and oxen in the bottom of the ditch, as well as some worked flint tools. The bones were considerably older than the antler picks used to dig the ditch, and the people who buried them had looked after them for some time prior to burial. The ditch was continuous but had been dug in sections, like the ditches of the earlier causewayed enclosures in the area. The chalk dug from the ditch was piled up to form the bank. This first stage is dated to around 3100 BC, after which the ditch began to silt up naturally. Within the outer edge of the enclosed area is a circle of 56 pits, each about 3.3 feet (1 m) in diameter, known as the Aubrey holes after John Aubrey, the 17th-century antiquarian who was thought to have first identified them. These pits and the bank and ditch together are known as the Palisade or Gate Ditch. The pits may have contained standing timbers creating a timber circle, although there is no excavated evidence of them. A recent excavation has suggested that the Aubrey Holes may have originally been used to erect a bluestone circle. If this were the case, it would advance the earliest known stone structure at the monument by some 500 years.
In 2013, a team of archaeologists, led by Parker Pearson, excavated more than 50,000 cremated bone fragments, from 63 individuals, buried at Stonehenge. These remains were originally buried individually in the Aubrey holes, but were exhumed in 1920 during an excavation by William Hawley, who considered them unimportant and in 1935 re-buried them together in one hole, Aubrey Hole 7. Physical and chemical analysis of the remains has shown that the cremated were almost equally men and women, and included some children. There is evidence that the underlying chalk beneath the graves was crushed by substantial weight, so the team concluded that the first bluestones brought from Wales may have been used as grave markers. Radiocarbon dating of the remains has put the date of the site 500 years earlier than previously estimated, to around 3000 BC. A 2018 study of the strontium content of the bones found that many of the individuals buried there around the time of construction had probably come from near the source of the bluestone in Wales and had not extensively lived in the area of Stonehenge before death.
Between 2017 and 2021, studies by Parker Pearson and his team suggested that the bluestones used in Stonehenge had been moved there following dismantling of a stone circle of identical size to the first known Stonehenge circle (110 m (360 ft)) at the Welsh site of Waun Mawn in the Preseli Hills. It had contained bluestones, one of which showed evidence of having been reused in Stonehenge. The stone was identified by its unusual pentagonal shape and by luminescence soil dating from the filled-in sockets which showed the circle had been erected around 3400–3200 BC, and dismantled around 300–400 years later, consistent with the dates attributed to the creation of Stonehenge. The cessation of human activity in that area at the same time suggested migration as a reason, but it is believed that other stones may have come from other sources.
Stonehenge 2 (c. 2900 BC)
The second phase of construction occurred approximately between 2900 and 2600 BC. The number of postholes dating to the early third millennium BC suggests that some form of timber structure was built within the enclosure during this period. Further standing timbers were placed at the northeast entrance, and a parallel alignment of posts ran inwards from the southern entrance. The postholes are smaller than the Aubrey Holes, being only around 16 inches (0.4 m) in diameter, and are much less regularly spaced. The bank was purposely reduced in height, and the ditch continued to silt up.
At least twenty-five of the Aubrey Holes are known to have contained later, intrusive, cremation burials dating to the two centuries after the monument's inception. It seems that whatever the holes' original function was, it became a funerary one during Phase two. Thirty further cremations were placed in the enclosure's ditch and at other points within the monument, mostly in the eastern half. Stonehenge is therefore interpreted as functioning as an enclosed cremation cemetery at this time, the earliest known cremation cemetery in the British Isles. Fragments of unburnt human bone have also been found in the ditch-fill. Dating evidence is provided by the late Neolithic grooved ware pottery found in association with the features of this phase.
Stonehenge 3 I (c. 2600 BC)
Archaeological excavation has indicated that around 2600 BC, the builders abandoned timber in favour of stone and dug two concentric arrays of holes (the Q and R Holes) in the centre of the site. These stone sockets are only partly known (hence, on present evidence, are sometimes described as forming 'crescents'); however, they could be the remains of a double ring. Again, there is little firm dating evidence for this phase. The holes held up to 80 standing stones (shown blue on the plan), only 43 of which can be traced today. It is generally accepted that the bluestones (some of which are made of dolerite, an igneous rock), were transported by the builders from the Preseli Hills, 150 miles (240 km) away in modern-day Pembrokeshire in Wales. Another theory is that they were brought much nearer to the site as glacial erratics by the Irish Sea Glacier although there is no evidence of glacial deposition within southern central England. A 2019 publication announced that evidence of Megalithic quarrying had been found at quarries in Wales identified as a source of Stonehenge's bluestone, indicating that the bluestone was quarried by human agency and not transported by glacial action.
The long-distance human transport theory was bolstered in 2011 by the discovery of a megalithic bluestone quarry at Craig Rhos-y-felin, near Crymych in Pembrokeshire, which is the most probable source of some of the stones. Other standing stones may well have been small sarsens (sandstone), used later as lintels. The stones, which weighed about two tons, could have been moved by lifting and carrying them on rows of poles and rectangular frameworks of poles, as recorded in China, Japan, and India. It is not known whether the stones were taken directly from their quarries to Salisbury Plain or were the result of the removal of a venerated stone circle from Preseli to Salisbury Plain to "merge two sacred centres into one, to unify two politically separate regions, or to legitimise the ancestral identity of migrants moving from one region to another". Evidence of a 110-metre (360 ft) stone circle at Waun Mawn near Preseli, which could have contained some or all of the stones in Stonehenge, has been found, including a hole from a rock that matches the unusual cross-section of a Stonehenge bluestone "like a key in a lock". Each monolith measures around 6.6 feet (2 m) in height, between 3.3 and 4.9 ft (1 and 1.5 m) wide and around 2.6 feet (0.8 m) thick.
What was to become known as the Altar Stone was believed to have been derived from the Senni Beds, perhaps from 50 miles (80 kilometres) east of the Preseli Hills in the Brecon Beacons. Work announced in 2024 by a team from Curtin University, who analysed the chemical composition of fragments of rock that had fallen off the Altar Stone, and dated them, found that the best match was with rocks in the Orcadian Basin (which includes Caithness, Orkney, and the Moray Firth regions of north-eastern Scotland). The researchers stated that this implies the stone was transported some 430 miles (690 km), and thus demonstrates cultural links between Southern England and Northern Scotland.