recommendations Spain Travel

How about recommendations for Barcelona?

Marina and I are off to the other capital of Spain (no offence to the Catalan nationalists) soon, what shouldn’t we miss? (We’ve done most of the Gaudi stuff in the past). What we really need is a list like the one below 😉

Update: Wow, I never knew Barcelona was so popular, just check out all the great recommendations in the comments below. No guidebook is as good as this! Thanks to all and keep them coming!