Solstice

Stonehenge's origins remain a mystery, but theories suggest the grounds were part of a huge astronomical calendar. Others say an ancient sun worshipping culture aligned the structure with the midsummer sunrise and the midwinter sunset. The site was used as a cremation cemetery since its inception, archaeologists say, but it is unclear if that was its main function.

"The truthful answer is we don't know exactly what it was for," said Amanda Chadburn, an archaeologist with English Heritage, which manages the site.

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