BARCELONA, SPAIN - APRIL 10:  'La Sagrada Familia' stands over residential buildings on April 10, 2015 in Barcelona, Spain. Barcelona's city hall has put a regulation in motion that bans 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)