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.
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.