I can only second the glowing reviews posted here. In what is a great city to begin with, these two buildings by the Catalan Art Nouveau architect Lluís Domènech i Montaner stand out even by Barcelona´s very high architectural standards. The hospital is probably like no other in the world (and the only one I´ve ever come across that is mentioned in a guidebook), and even though a new hospital is currently being built, it´s still a working place with real patients inside; it´s within easy walking distance of the Sagrada Familia. The Palau de la Música Catalana, located close to the Cathedral in the Barrio Gótico, is not terribly impressive from the outside, but the inside, especially the auditourium, is just fantastic. Even if you´re not really into classical music, it´s well worth the long wait in line to get tickets for a guided tour (if English is sold out, you could still try Spanish or Catalan, even if you don´t understand it, since the important thing is to SEE the inside!). Two of the finest buildings I have ever seen, and a must when coming to Barcelona.