Highly recommend a multi-day transport pass instead of the official bus tour (although you can do that as well!). You get unlimited access to the whole Zone 1 network, (trains; to and from the airport, metro, trams, buses, funicular railways) for a cheaper cash outlay with a greater reach. For the real explorers out there, this is a great option.

From the tourist office at Barcelona Airport or at any metro station.

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