Gaudi architecture and Modernist Barcelona
Gaudi architecture includes the Parc Güell, the still unfinished Sagrada Família and the houses; La Pedrera/Casa Milà and La Casa Batlló.
The Ruta del Modernisme run by Modernisme Centre (Pl. de Catalunya, 17, subterráneo; phone +34 933 177 652): guidebook and discount voucher book for ?12. Takes you round all the best Modernisme (art nouveau) buildings in Barcelona. The main part of the route can be walked in a couple of hours, providing you don't stray too far from the main routes. The Tourist Offices offer a pack that includes discounted tickets to many attractions such as La Pedrera and La Casa Batlló. All can be seen from the outside for free.