The Sagrada Família in Spain is the longest-running active project today

This famous church in Barcelona was designed by an architect named Antoni Gaudí. Workers laid the first stone in 1882. Gaudí knew he would not live to see it finished. He once joked that his 'client' (God) was in no hurry. The project has faced many stops and starts. A civil war destroyed Gaudí's original plaster models, and workers had to piece his designs back together like a puzzle. Because the church is funded only by visitor ticket sales and donations, progress has been slow. It has been under construction for over 140 years, which is longer than it took to build the Great Pyramids of Giza.