Barcelona decided to resemble no one: one genius filled it with dream architecture, and around his marvels lives a complete Mediterranean city of Gothic lanes, urban beach and breathing harbor. Gaudí first (book Sagrada weeks ahead, Park Güell, Batlló and Milà on Passeig de Gràcia), then the old city's golden walking days, then Barceloneta and Montjuïc's dancing fountain. Book every Gaudí ticket online — walk-up queues are legend; and mind Rambla and metro pockets knowingly — the pickpocket fame is real but simple care suffices.