Barcelona

Barcelona is the capital and largest city of Catalonia, and both Spanish and Catalan are widely spoken. The city is a transportation hub and one of the economic capitals of southern Europe, as well as Spain's top biotech metropolis.

Barcelona is best visited in early summer or fall, as late summer may be hot and humid. Book your vacation in May, June, September, or October for the best weather—there will be plenty of sun and pleasant temps for swimming and strolling through the city's beautiful streets, parks, and markets.