Casa Milà, popularly known as La Pedrera, is a modernist building in Barcelona, Catalonia, Spain. It was the last civil work designed by architect Antoni Gaudí, and was built from 1906 to 1912. The building was commissioned in 1906 by businessman Pere Milà i Camps and his wife Roser Segimon i Artells. At the time, it was controversial because of the undulating stone facade and twisting wrought iron balconies and windows designed by Josep Maria Jujol. Structural innovations include a self-supporting stone front and columns, and floors free of load bearing walls. Also innovative is the underground garage. In 1984 it was declared a World Heritage Site by UNESCO. Currently, it is the headquarters of the Catalunya-La Pedrera Foundation, which manages the exhibitions, activities and public visits at Casa Milà.