While in Barcelona a few months ago, I visited the Nacional Museu d'Art de Catalunya which was near the Barcelona Pavilion and was built for the same world's fair as the head building. It has some of the best views over all of Barcelona and also a fantastic restaurant on the mezzanine level overlooking the city surrounded by a BEAUTIFUL fresco'd ceiling (which is why I went to see it). 
The rest of the museum is amazing though -housing works of art by masters of art from the medieval period to current times including a large portion of the Thyssen Bornemisza collection. Included are some of MY highlights from the museum :-) If you get to Barcelona it's a must-see!
the back of this ancient church door was so modern looking, I loved it (even had my picture taken beside it!) while the front was more what would be expected -but the colors still so VIVID
this was the coolest little model of a room! We had a lot of fun looking into this!
these 2 portraits were so spanish and SO beautiful! I love the colors
