Of all the things to see in Barcelona, I found this the most impressive. I was never a fan of Gaudi's until I went inside this building. The audio commentary explained everything in an easy to understand interesting way and highlighted how much thought Gaudi put into the place. It might look gaudy and gross from the outside but the inside is brilliant. It's well worth the price of admission, which might seem exorbitant, but the money goes back into maintaining it as there is no government support. If you're in Barcelona to check out the sights this is an absolute must.