Even jaded teens, like my 13-year-old niece ... the Sagrada Familia, Barcelona's most famous site and Spain's most visited. More than 40 years after the eccentric and revered architect's death ...

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 ...