The Basílica i Temple Expiatori de la Sagrada Família (English: Basilica and Expiatory Church of the Holy Family) is a large Roman Catholic church in Barcelona, designed by Catalan architect Antoni Gaudí (1852–1926). Gaudí's work on the building is part of a UNESCO World Heritage Site, and in November 2010 Pope Benedict XVI consecrated and proclaimed it a minor basilica, as distinct from a cathedral, which must be the seat of a bishop. Construction of Sagrada Família commenced in 1882 by architect Francisco Paula de Villar with Gaudí becoming involved in 1883 after Francisco resigned as the head architect. Taking over the project, Gaudí transformed it with his architectural and engineering style, combining Gothic and curvilinear Art Nouveau forms. Gaudí devoted his last years to the project, and at the time of his death at age 73 in 1926, less than a quarter of the project was complete.