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Revellers perform yoga as they celebrate the summer solstice on Salisbury Plain in southern England June 21, 2014. Stonehenge is a celebrated venue of festivities during the summer solstice - the longest day of the year in the northern hemisphere - and it attracts thousands of revellers, spiritualists and tourists. Druids, a pagan religious order dating back to Celtic Britain, believe Stonehenge was a centre of spiritualism more than 2,000 years ago. REUTERS/Kieran Doherty (BRITAIN)