Originally Posted by abaya

You MUST see the Gaudi stuff in Barcelona. It's worth going there JUST to see that... I dunno about the Dali museum (I'd go anyway), but when I was there, Gaudi took up all our time. There's the Sagrada Familia "cathedral" (incredible) and Parc Guell, also unmissable. Seriously. And of course Las Ramblas in Barcelona, but you'll probably find your way there automatically.

You planning to stay in hostels? I don't know any in Madrid, but we had a good one in Barcelona that we reserved ahead of time... I could try to find the name for you if you're interested. You ought to get a copy of a Lonely Planet guide before going, seriously.

How long is your stay?