Sagrada Familia is a Roman Catholic cathedral still under construction in Barcelona. Work on the cathedral started in 1882 and Gaudi himself worked on it for 40 years, 15 of which he dedicated exclusively to it, until his death in 1926. When asked about the deadline of his project, now scheduled to 2026, Gaudi said "My client is not in a hurry."
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La Sagrada Familia Church, Barcelona, Spain; photo by Richard Nowitz