One of the nicest places I visited in Barcelona was Parc Güell. The park was
designed by Antoni Gaudi, as some other buildings in Barcelona. But while these
other buildings seemed more like little islands in the huge city, the style of
Gaudi is much more present in that park. There you can really explore and enjoy
the strange kind of architecture typical for his buildings. Nothing is really
straight and nevertheless everything follows some kind of order. Well... just
go there and take a look yourself!