Who built Stonehenge, and what was it for?

What archaeology found: the building stages

Stonehenge stands on Salisbury Plain in Wiltshire, England. Its earliest phase, raised around 3000 BC, was a circular earthwork enclosure: a ditch dug with antler tools, its chalk piled into inner and outer banks, English Heritage records. Inside sat a ring of 56 pits, the Aubrey Holes, which once held timber or stone posts. For centuries this phase served as a cremation cemetery, with burned human remains placed in the ditch, bank and Aubrey Holes.

Around 2500 BC the site was transformed: more than 80 sarsen stones, hauled from 15 miles away, were raised at the center in two concentric arrangements, with smaller bluestones set among them, per English Heritage's timeline. Between 2300 and 2200 BC the bluestones were rearranged into a circle and inner oval, and workers dug an earthwork Avenue to the River Avon. Bronze Age carvers later added axehead and dagger carvings to four sarsens; building and rearrangement spanned over 800 years in total.

Where the sarsens and bluestones came from

No one could say exactly where the sarsens were quarried until July 2020, when geomorphologist David Nash of the University of Brighton and colleagues published a geochemical study in Science Advances. Testing all 52 surviving sarsens with portable X-ray fluorescence, then analyzing a core drilled from one upright in the 1950s and returned to England from Florida in 2019, the team matched 50 of the 52 sarsens to West Woods, Wiltshire, 15 miles away. "We didn't think we'd get a direct match," Nash said. "It was a real 'Oh my goodness' moment."

The bluestones traveled much farther, from the Preseli Hills in Wales, roughly 180 miles away. Archaeologist Mike Parker Pearson of University College London and colleague Rob Ixer identified two quarries, Craig Rhos-y-felin and Carn Goedog, excavated between 2014 and 2016, linking at least five of Stonehenge's roughly 80 bluestone blocks to the sites. Charcoal there was radiocarbon-dated to about 3,000 BC, matching when construction began. Natural vertical fractures let quarry workers free ready-shaped, six-foot pillars, which Parker Pearson called the "Ikea version of Neolithic megaliths."

The Altar Stone's Scottish origin

Stonehenge's Altar Stone, a flat sandstone block near the monument's center, was long grouped with the Welsh bluestones. A 2024 study led by geologist Anthony Clarke of Curtin University, published in Nature that August, overturned that: dated mineral grains in Altar Stone fragments, one to two billion years old alongside grains around 450 million years old, matched rock in the Orcadian Basin of northeast Scotland, at least 750 kilometers, or 466 miles, away, the longest known transport distance for any stone in a Neolithic monument.

Builders set the Altar Stone in place between 2620 and 2480 BC. Co-author Chris Kirkland said hauling a stone that size overland across such a distance "would have been extremely challenging," and the team suggested it more likely moved partway by sea along the coast of Britain.

How Stonehenge was built

Builders shaped the stones with sarsen and flint hammerstones, then joined them with mortice-and-tenon joints, fitting a carved knob atop each upright into a socket cut into the lintel above, while neighboring lintels were locked with tongue-and-groove joints, carpentry techniques rarely used in stone, English Heritage explains. A shaped stone was tipped into a pit and hauled upright "using plant fibre ropes and probably a wooden A-frame." How 30-ton sarsens were dragged 15 miles, and the Altar Stone reached Wiltshire from Scotland, is still unclear.

Who built Stonehenge

The builders were Neolithic and, in later phases, early Bronze Age farming communities of southern Britain, English Heritage says. History.com notes Neolithic Britons "used primitive tools" for the earliest ditch and bank, and that modern scholars believe several distinct groups contributed to Stonehenge across its building phases. These communities left no written records, so nothing is known of them by name, only through their monuments, tools and bones.

The leading theories about its purpose

No single explanation is agreed on. English Heritage says the sarsens raised around 2500 BC "were carefully placed to line up with the movements of the sun," and that the cleared ground inside suggests people gathered "to celebrate midsummer and midwinter." The site was also a burial ground from its earliest phase, with cremated remains "in the ditch and bank of the henge, and in the so-called Aubrey Holes." Archaeologist Tim Darvill has separately proposed the bluestones were valued for healing, a "prehistoric healing sanctuary," National Geographic reports.

A 2019 study led by Richard Madgwick of Cardiff University, published in Science Advances, analyzed isotopes in 131 pig bones from four nearby Late Neolithic sites, including Durrington Walls, finding most pigs were driven in on the hoof from as far as 350 miles off, in Wales or Scotland, for communal feasts. Parker Pearson has separately argued Stonehenge and the wooden monuments at Durrington Walls formed one complex, stone for the ancestors and timber for the living, calling Stonehenge "a kind of spirit home to the ancestors."

The Merlin legend

Centuries later, medieval legend gave Stonehenge a different origin. Geoffrey of Monmouth, a 12th-century writer, credited the wizard Merlin with the monument in his account of the kings of Britain: King Aurelius Ambrosius sent soldiers to fetch an existing stone circle from Ireland, and when they could not move it, Merlin "used his sorcery to spirit them across the sea and arrange them above the mass grave" of British nobles killed by the Saxons, History.com reports.

National Geographic separately records the same folklore, that Merlin "magically transported the massive stones from Ireland." No archaeological evidence supports either version. As History.com puts it, Stonehenge's actual construction "predates Merlin...by several thousand years"; the wizard belongs only to legend.

What is still unsolved

Even with the sarsens, bluestones and Altar Stone traced to source, no one has pinned down the exact quarry faces within West Woods, worked out how 30-ton sarsens were hauled 15 miles, or confirmed whether the Altar Stone traveled by land, sea, or both. Which purpose mattered most to the people who kept rebuilding Stonehenge over 800 years also remains unresolved.

Questions people ask

Verdict

Who built Stonehenge, and where its stones came from, is well documented: Neolithic and early Bronze Age communities in southern Britain raised it in stages from about 3000 BC, using sarsens from West Woods, bluestones from the Preseli Hills, and an Altar Stone hauled from Scotland. Real or Legend stamps the deeper mystery, what it was actually for, disputed: named researchers back a solar-aligned temple, a burial ground, a feasting site and a home for ancestors, with no theory settled. The Merlin story is a medieval legend, not a contender.