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VENICE, ITALY - JULY 22: Tourists take pictures with the pigeons in Saint Mark's Square on July 22, 2015 in Venice, Italy. With an estimated number of 27 million visitors per year the Venice local government is examining options to restrict access to the busiest areas. (Photo by Awakening/Getty Images)

VENICE, ITALY - JULY 22:  Tourists take pictures with the pigeons in Saint Mark's Square on July 22, 2015 in Venice, Italy. With an estimated number of 27 million visitors per year the Venice local government is examining options to restrict access to the busiest areas.  (Photo by Awakening/Getty Images)