La Pedrera or Casa Milà, is a building designed by the great Spanish master Antoni Gaudí located in the center of Barcelona, on Paseo de Gracia, cataloged as a World Heritage Cultural Asset by UNESCO. Its construction was carried out between 1906 and 1912, being one of the most innovative civil works of the Catalan architect. This building stands out for its façade, which is neither structural nor a load-bearing wall, but rather becomes a curtain wall where more than 6,000 stone blocks are joined to the structure by metallic elements. The forge is another of its distinctions both as an architectural complement and as an ornamental contribution.Over the years, this building has accommodated distinguished guests - including a prince and his entourage -, it has been a hotel, headquarters of a consulate, bingo, company offices and shops. Its construction was commissioned by the marriage formed by Pere Milà and Rosario Segimon, hence it is known by the name of Casa Milà. The intention of this couple was to create a unique building in which to stay on the main floor while they rented the rest of the houses. After some complications with the building permits, in 1912 the end of the works on the building was certified, thus settling the Milà couple and renting the rest of the houses. In 1929, the first store in La Pedrera was installed, on the ground floor of the building, the Mosella tailor shop. During the Spanish Civil War, 1936-1939, Casa Milà was confiscated by the Unified Socialist Party of Catalonia (PSUC), becoming the headquarters of the Ministry of Economy and Agriculture and the private residence of the minister Joan Comorera who settled on the main floor. In 1940 Pere Milà died and his widow, Rosario Segimon, six years later, in 1946, sold the building to the Provenza real estate company with the condition that they continue to live on the main floor until his death in 1964. In 1953, this real estate company commissioned to the architect Francisco Juan Barba Corsini the construction of 13 apartments in the attic of the building and the transformation of the first floor on Provenza Street into four apartments of more than 100 m² each, giving us an idea of the dimensions of the building. In 1986 the Caixa de Catalunya bank bought the building from the Provenza Real Estate. In 1987 the visit to the roof of La Pedrera was opened for the first time and the building was restored to turn it into a cultural center. In 1992, the exhibition hall was inaugurated with the exhibition Avant-garde in Catalonia, forming part of the cultural program of the 1992 Olympic Games. IN 1994, the La Padrera auditorium was inaugurated in the old garages of the building . Finally, in 1996 the restoration works were completed under the motto "For Barcelona we do not give a grain of sand but an entire Pedrera".