After visiting La Sagrada and Park Güell, the natural progression was to cram in all the other Gaudi places that day... I visited Casa Mila and Casa Batlló (the outside only, the tickets were extraordinarily expensive!). For all his fancy architecture, I'm still only so-so about Gaudi. I think I preferred a lot of the other architecture of Barcelona, which was a lovely mish-mash of modern and historical styles.