Stonehenge, prehistoric stone circle monument, cemetery, and archaeological site located on Salisbury Plain, about 8 miles (13 km) north of Salisbury, Wiltshire, England. Though there is no definite evidence as to the intended purpose of Stonehenge, it was presumably a religious site and an expression of the power and wealth of the chieftains, aristocrats, and priests who had it built—many of whom were buried in the numerous barrows close by. It was aligned on the Sun and possibly used for observing the Sun and Moon and working out the farming calendar. Or perhaps the site was dedicated to the world of the ancestors, separated from the world of the living, or was a healing centre. Whether it was used by the Druids (Celtic priests) is doubtful, but present-day Druids gather there every year to hail the midsummer sunrise. Looking toward the sunrise, the entrance in the northeast points over a big pillar, now leaning at an angle, called the Heel Stone. Looking the other way, it points to the midwinter sunset. The summer solstice is also celebrated there by huge crowds of visitors.

There is debate surrounding the original purpose of Stonehenge. Previously thought to be a Druid temple, Stonehenge may instead be, according to researchers and others, a burial monument, a meeting place between chiefdoms, or even an astronomical “computer.”

Stonehenge was not built by aliens. The claim gained popularity by way of the book Chariots of the Gods?, published in 1968, in which its author, Erich von Däniken, claimed that many monuments, including Stonehenge, may have been built by extraterrestrials. Von Däniken’s claims and others like them have been debunked by scientists and other researchers.

It is not clear who built Stonehenge. The site on Salisbury Plain in England has been used for ceremonial purposes and modified by many different groups of people at different times. Archaeological evidence suggests that the first modification of the site was made by early Mesolithic hunter-gatherers. DNA analysis of bodies buried near Stonehenge suggests that some of its builders may have come from places outside of England, such as Wales or the Mediterranean.

Stonehenge is the world’s most famous stone circle, visited by more than a million people per year. It stands as an icon for all that is mysterious and awe-inspiring about humanity’s prehistoric past. For well over a century, people have gathered at the monument to celebrate the summer solstice.