The Mystery of Stonehenge — 5 Theories Explained

Stonehenge has stood on Salisbury Plain for over 4,500 years. Despite decades of modern archaeological research, the question of why it was built still has no single definitive answer. Here are the five most credible theories.

Theory 1: Astronomical Calendar

The most famous explanation is that Stonehenge functioned as a precision astronomical instrument. The Heel Stone aligns with the midsummer sunrise; the sarsen circle aligns with the midwinter sunset. Archaeoastronomers believe the monument tracked the movements of the sun and moon, acting as a luni-solar calendar to regulate planting seasons and ceremonial dates. In 1963, astronomer Gerald Hawkins published “Stonehenge Decoded”, arguing that the 56 Aubrey Holes could predict eclipses. While his specific claims were later contested, his work catalysed serious archaeological interest in the monument’s solar alignments. More recently, a 2022 study by Professor Timothy Darvill of Bournemouth University proposed that Stonehenge functioned as a solar calendar based on a 365-day year divided into 12 months — remarkably similar to the calendar used by ancient Egyptian civilisations. Darvill’s analysis of the sarsen circle’s geometry, published in the journal Antiquity, demonstrates how the 30 uprights of the sarsen circle represent 30 days of a month, with specially designated stones marking intercalary days.

Theory 2: Burial Site

Excavations have uncovered the cremated remains of more than 60 individuals, dating from roughly 3000 to 2500 BC. This makes Stonehenge one of the largest and longest-used cremation cemeteries in prehistoric Britain. It may have been a monument built to honour and house the dead. Professor Mike Parker Pearson, who directed the Stonehenge Riverside Project (2003–2009), noted that the cremated remains show evidence of selective burial — not everyone was deposited here, only certain individuals, perhaps elites or ritual specialists. The Aubrey Holes originally held the cremation burials, and radiocarbon dating confirms that burial activity continued for at least 500 years, suggesting that Stonehenge served as a dynastic cemetery for an extended lineage of Neolithic rulers.

Theory 3: Healing Centre

The bluestones were transported over 200 miles from the Preseli Hills in Wales — an extraordinary effort. Some researchers argue people made this journey because the stones were believed to carry curative powers. Evidence of skeletal remains showing healed injuries supports the idea of a prehistoric Lourdes. Professor Geoffrey Wainwright and Professor Timothy Darvill, co-directors of an excavation inside the stone circle in 2008, championed this theory, pointing out that many of the bluestones have distinctive spotted dolerite properties that were associated with healing springs in Welsh folklore. The team discovered a double bluestone arc at the centre of the monument, which they argued was deliberately placed to enhance the site’s perceived therapeutic power. Further analysis of human remains from the surrounding burial mounds shows a high proportion of individuals with skeletal trauma and disease compared to contemporary non-local populations, suggesting that Stonehenge attracted sick and injured people from across Britain — consistent with the healing centre hypothesis.

Theory 4: Ancestor Veneration

Another school of thought holds that Stonehenge was a monument to connect the living with the dead. The stones may represent ancestors, with rituals conducted at the site to honour and communicate with those who had passed. Archaeologist Dr. Julian Thomas of the University of Manchester has argued that Stonehenge functioned as part of a wider ritual landscape where the boundary between the living and the dead was deliberately blurred. The Avenue connecting Stonehenge to the River Avon may have been a symbolic route for the souls of the dead to travel between the world of the living and the ancestral realm. The discovery of the “Stonehenge Archer” — a burial of a mature man found in the ditch with three barbed-and-tanged arrowheads still embedded in his ribs — adds evidence that the site held deep spiritual significance tied to identity, ancestry, and belonging.

Theory 5: Sound Temple

Acoustic researchers have found that the stone arrangement would have created remarkable standing waves and echoes during ceremonies. Drumming and chanting inside the original complete circle would have produced an almost disorienting sonic experience. Dr. Rupert Till of the University of Huddersfield has conducted extensive acoustic modelling of the original sarsen circle, demonstrating that the stone arrangement would have amplified low-frequency sounds — particularly drumming and deep chanting — by up to 4 decibels. Till’s research, published in Applied Acoustics, suggests that the acoustic properties created a “shamanic” auditory environment capable of inducing altered states of consciousness. The wooden circles at nearby Durrington Walls, which Till also modelled, produced quite different acoustic signatures — sharper and more rhythmic — indicating that each monument in the landscape may have served a distinct sonic purpose in Neolithic ceremonies.

Conclusion

Most archaeologists today believe Stonehenge served multiple purposes across its 1,500-year construction history. It was probably all of these things at different times — and that layered complexity is precisely what makes it so endlessly fascinating.

Frequently Asked Questions

How many people built Stonehenge? Estimates vary, but most archaeologists agree that constructing the sarsen circle alone would have required at least 600 people working for several months to transport and erect the stones. The total workforce across all phases of construction likely numbered in the thousands.

Are the bluestones really from Wales? Yes, petrographic analysis confirms that the smaller bluestones originate from the Preseli Hills in Pembrokeshire, Wales — approximately 200 miles from Stonehenge. How they were transported — by sea, river, or land — remains one of the monument’s great unsolved mysteries.

Has all of Stonehenge been excavated? No. Only about half of the Stonehenge landscape has been subjected to modern scientific excavation. Large areas remain undisturbed, meaning future discoveries could dramatically change our understanding of the site.