U.S. News Insider Tip: Wander 20 minutes north to reach Hospital de Sant Pau. This elaborate, UNESCO-listed former hospital was the brainchild of architect Lluis Domènech i Montaner and is a ...

Barcelona, Spain's second-largest city, is inextricably linked to the architecture of Antoni Gaudi. His most famous and unfinished masterpiece, La Sagrada Familia, is the emblem of the city.