SALISBURY, UNITED KINGDOM - JUNE 21: Revelers take part in celebrations to mark the summer solstice at Stonehenge prehistoric monument on June 21, 2015 in Wiltshire, England. Thousands of revellers gather at the 5,000 year old stone circle in Wiltshire to see the sunrise on the Summer Solstice dawn. The solstice sunrise marks the longest day of the year in the Northern Hemisphere. (Photo by Tolga Akmen/Anadolu Agency/Getty Images)
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