Barcelona is a dynamic, beautiful city, with a lot to see in the Ciutat Vella (old town) and the other central districts Eixample and Grácia. It is famous for Gaudí's spectacular architecture, above all Parc Güell, Sagrada Família, and a number of other buildings. La Rambla is a lovely pedestrian precinct, and the nearby Plaça Reial is a lovely square for a relaxed sangria and tapas. Shopping galore on Passeig de Grácia. A flamenco performance in a tablao is well worth seeing. The nightlife scene offers a lot: start at La Rambla or at Port Olimpic near the seafront. People will appreciate you saying a few words in the local language, but remember it's Catalan, and not Spanish!