A group of tourists enjoy a Segway tour in La Barceloneta suburb in Barcelona on June 28, 2015. Tourists generated 14% of municipal GDP, but these 27 million visitors in Barcelona are a headache for the new mayor Ada Colau , who wants to prevent this Mediterranean port from becoming a theme park. AFP PHOTO / QUIQUE GARCIA

TO GO WITH AN AFP STORY BY DANIEL BOSQUE / AFP / QUIQUE GARCIA        (Photo credit should read QUIQUE GARCIA/AFP/Getty Images)