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EDINBURGH, SCOTLAND - APRIL 30: Beltane Fire Society performers celebrate the coming of summer by participating in the Beltane Fire Festival on Calton Hill April 30, 2015 in Edinburgh, Scotland. The event, first organized in the mid-1980's, celebrates the ending of winter and is a revival of the ancient Celtic and Pagan festival of Beltane, the Gaelic name for the month of May. (Photo by Roberto Ricciuti/Getty Images)

EDINBURGH, SCOTLAND - APRIL 30:  Beltane Fire Society performers celebrate the coming of summer by participating in the Beltane Fire Festival on Calton Hill April 30, 2015 in Edinburgh, Scotland. The event, first organized in the mid-1980's, celebrates the ending of winter and is a revival of the ancient Celtic and Pagan festival of Beltane, the Gaelic name for the month of May.  (Photo by Roberto Ricciuti/Getty Images)