The open top bus tours are the best way of getting around Barcelona. There are three interlinked routes, the main two of which set off from the Placa de Catalunya. They take you to all the major attractions like Casa Battllo, La Pedrera, Sagrada Famillia, Park Guell (the main Gaudi buildings), the palaces, the Camp Nou, the Olympic park etc. And it's dead cheap. If the weather's good, use these buses if you can because it'll be too hot on the metro.

Several ticket offices on La Rambla

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