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People attend the annual summer solstice at the Stonehenge monument on Salisbury Plain in Wiltshire, southern England June 21, 2010. Thousands of druids, revellers and the simply curious witnessed a cloud-obscured sunrise at Stonehenge during an annual pilgrimage to the site to celebrate the summer solstice, the longest day of the year. REUTERS/Kieran Doherty (BRITAIN - Tags: ANNIVERSARY ENVIRONMENT SOCIETY)