Protesters used water pistols against unsuspecting tourists in Barcelona on Sunday as demonstrators marched to demand a re-think of an economic model they believe is fueling a housing crunch and erasing the character of the Spanish city.

Tourism is hugely important to Spain and Barcelona is a top destination for visitors. But the crowds are growing so fast that many locals complain they're being squeezed out of their own cities. Here and in popular spots across southern Europe,