Between 1984 and 2005, seven of his works were declared World Heritage Sites by UNESCO. The seven works were: the Park Güell, the Palau Güell and the Casa Milà; the Nativity facade, the crypt and the apse of the Sagrada Família, the Casa Vicens and the Casa Batlló in Barcelona, and the crypt of the Colònia Güell in Santa Coloma de Cervelló.