Sagrada Família
Gaudi worked on it until he died. At the time of his death in 1926, less than a quarter of the building was finished. The Sagrada Familia's building was slow. It needed private donations (people giving money to it). It was stopped by the Spanish Civil War—only to start again in the 1950s. Building was more than halfway done after 2010. Some of the project's biggest problems still remain.