Casa Milà (also known as La Pedrera, meaning the 'The Quarry'), is a modernist building located at 92, Passeig de Gràcia (passeig is Catalan for promenade) in Barcelona, Catalonia, Spain, at the corner of Carrer de Provença, in the Eixample. It was the last civil work designed by Catalan architect Antoni Gaudi and it was built between the years 1906 and 1910. In 1912, Gaudí and the Milà i Segimon marriage signed the contract of completion of the work of the Casa Milà.
It was commissioned by businessman Pere Milà i Camps and his wife Roser Segimon i Artells, from Reus and widow of the wealthy Indian Josep Guardiola i Grau. At the time it was very controversial because of the bold undulating stone facade and twisted wrought iron that decorate the balconies and windows, designed mostly by Josep Maria Jujol, who also designed some of the skies of plaster.
Architecturally it is considered an innovative work by having a structure of columns and floors free of load bearing walls. Similarly, the front – which is made of stone – is also self-supporting, i.e., not loads of floors. Another innovative element was the construction of the underground garage. In 1984, it was declared a World Heritage Site by UNESCO. It is currently the headquarters of the Fundació-Catalunya La Pedrera, which manages the various exhibitions and activities done there and the public visits.