Casa Batllo (World Heritage Site) - One of 2 houses by Gaudí in Barcelona that can be toured. truly amazing and worth the visit. go in the mornings, before the site gets crowded with architecture students.
Casa Batlló, Barcelona, Spain by Amirhossein Mohtasebi via "Casa Batlló is a building restored by Antoni Gaudí and Josep Maria Jujol, built in 1877 and remodelled in the years Gaudí's assistants Domènec Sugrañes i Gras, Josep Canaleta y
Casa Milà, commonly known as La Pedrera is the largest civil building designed by Antoni Gaudí. The apartment block was constructed between 1906 and It was Gaudí's last work before devoting himself to the construction of the Sagrada Família.