BARCELONA, SPAIN - APRIL 10: Tourists visit 'La Boqueria' green market on April 10, 2015 in Barcelona, Spain. Barcelona's city hall has put in place new regulations that ban large tourist groups visiting Barcelona's most popular market. Barcelona's authorities are debating how to control the number of tourist in the city as an estimated 10 million people are due to visit this year. (Photo by David Ramos/Getty Images)
