This is not a scene from Ari Aster's "Midsommar."

A seemingly curious alliance of druids, pagans, hippies, local residents, and tourists gathered around a prehistoric stone circle on a plain in southern England to express their devotion to the sun, or to have some communal fun.

They stayed for the night and greeted sunrise on Wednesday, which will be the longest day in the Northern Hemisphere.

All over the U.K., optimism will reign supreme as summer officially starts. It's no coincidence that one of the world's biggest music events, opens its doors on Wednesday, too. Both Stonehenge and Glastonbury supposedly lie on ley lines — mystical energy connections across the U.K.

For the thousands making the route to Stonehenge, approximately 80 miles (128 kilometers) southwest of London, it is more than at Glastonbury or a few ciders in the sun.

For druids, modern-day spiritualists linked to the ancient Celtic religious order, Stonehenge has centuries-long importance, and they will be there to perform dawn rituals around the solstice in their traditional white robes. It's effectively all about the cycle of life, death, and rebirth.

This year, started at 7:00 p.m. Tuesday and ran through 8:00 a.m. Wednesday. For this one night, worshippers are allowed to spend time inside the stone circle. Others chant or play their acoustic guitars. Alcohol is prohibited, as are sound systems. Bring a blanket, but no sleeping bags, please. And definitely, no climbing on the stones.

The rules have been tightened over the decades, certainly during COVID-19. Back in the less-restrained past, tens of thousands would travel by foot, car, bus, or motorcycle to worship at the solar temple, or just have a bit of fun.

It's a symbol of British culture and history and remains one of the country’s biggest tourist draws, despite the seemingly permanent traffic jams on the nearby, a popular route for motorists traveling to and from the southwest of England.

Stonehenge, one of the world’s most famous prehistoric monuments and a World Heritage Site, was built on the flat lands of Salisbury Plain in stages starting 5,000 years ago, with the unique stone circle erected in the late Neolithic period about 2,500 B.C. Some of the stones, the so-called bluestones, are known to have come from the Preseli Hills in southwest Wales, nearly 150 miles (240 kilometers) away, but the origins of others remain a mystery.

The site’s meaning has been the subject of vigorous debate, with some theories seemingly more outlandish, if not alien, than others.

English Heritage, a charity that manages hundreds of historic sites, notes several explanations — from Stonehenge being a coronation place for Danish kings, a druid temple, a cult center for healing, or an astronomical computer for predicting eclipses and solar events.

The charity said the most generally accepted interpretation "is that of a prehistoric temple aligned with the movements of the sun."

After all, the stones match perfectly with the sun at both the summer and winter solstices. On the summer solstice, the sun rises behind the Heel Stone in the northeast part of the horizon and its first rays shine into the heart of the stone circle. When the sky is clear, those rays are a triumphant spectacle to behold.