Casa Milà, also known as La Pedrera, is a modernist building in Barcelona designed by architect Antoni Gaudí between 1906 and 1912. It was commissioned by Pere Milà and his wife Roser Segimon and declared a World Heritage Site by UNESCO in 1984. The unconventional rough-hewn style of the building led to it being nicknamed "La Pedrera" or "the stone quarry" and was subject to criticism when it was built.