In Barcelona, there's a walk that's much more impressive than anything on La Rambla, and that's the Passeig de Gracia where you can see the majority of Barcelona's Gaudi-inspired buildings not in the Park Guell, in what they call the Block of Discord (in Catalan, Illa de la Discordia, or Bone of Discord), because of all the out of place buildings designed by various modernist architects of various ideas. Most of the buildings have a 5 or so euro charge to enter, where you get to see one or two rooms. At Casa Batllo though - the one designed by Gaudi - you can walk around most of the house, and though it's empty of the furniture (which Gaudi also designed), you at least get to see the basics of his interior design ideas.
Most of those fancy Passeig houses you're only allowed in to see one or two rooms, so many of the tours seem a waste of time to me. The only one with a full tour of the original construction - I say original, even though Batllo was a renovation by Gaudi and not his construction - was Casa Batllo and that cost an absurd 15 euro just for a walk-around.
a view from the Bone of Discord
My wife and I decided to throw in the money that it cost. Why not? We're only in Barcelona once. And of course, all the touristic activities are expensive because the operators know that same logic. Why tame your price when there's an endless demand for your historical place and you are the one supply? Simple economics there. And anyways, Gaudi was building his places for the rich, not for poor, backpacker travelers who would end up stinking up the corridors under his rib bone arches and playing pan flute inside his water chamber, in-between moments of talking about the latest Paolo Coehllo book about taming your animal spirit so that you can achieve all your dreams that you were meant to be through the realization of yourself as you are not as you are expected to be by those who don't really know you Iamalion roar.