Casa Milà is a Modernista building in Barcelona, Catalonia, Spain. It was the last private residence designed by architect Antoni Gaudí. Built between 1906 and 1912, the building was commissioned by Roser Segimón and her second husband Pere Milà in 1905 with the intention of living on the main floor and renting out the rest of the apartments, hence the Casa Milà, the new home of the Milà family. The building is popularly known as La Pedrera (the stone quarry), in reference to its unconventional rough-hewn appearance.
In 1973, the architect discovered an old cement factory no longer in use in Sant Just Desvern, a town in Catalonia, Spain, just outside of Barcelona. The factory was dated from the first period of the industrialization of Catalonia, and as such, was not built at once or as a whole, but as a series of additions as the various chains of production became necessary. It consisted of enormous silos, a tall smoke stack, machine rooms, some four kilometres of underground tunnels and stairs that climbed to nowhere.