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This is where the most famous celebration of the summer solstice takes place. Thousands of people, many of whom wear traditional Celtic attire, camp out for four days every year at the ancient prehistoric site. Many locals believe that Stonehenge was the site of ancient druid solstice celebrations because of the way the sun lines up with the stones on solstices. The 8thStonehenge Summer Solstice Festival is June 18-21, with sunrise at 4:15 am on June 21.