4,000-year-old 'Seahenge' in UK was built to 'extend summer,' archaeologist suggests

A mysterious Bronze Age wooden circle known as "Seahenge" on England's east coast was built more than 4,000 years ago in an effort to bring back warmer weather during an extreme cold spell, a new study suggests.
The theory is a new attempt to explain the buried structure — a rough circle about 25 feet (7.5 meters) across, made from 55 split oak trunks surrounding a "horseshoe" of five larger oak posts around a large inverted oak stump — that was controversially dug up and moved into a museum in 1999.
The construction took place during "a prolonged period of decreased atmospheric temperatures and severe winters and in late springs placing these early coastal societies under stress," he said in a statement. "It seems most likely that these monuments had the common intention to end this existential threat."
Nance detailed his study of the two Seahenge structures — known formally as Holme I and Holme II — in a research paper published April 2 in GeoJournal.