15 Largest Cities in Spain, Ranked by Population

Sagrada Família in Barcelona, Spain, is considered the world's longest ongoing construction project, with its construction beginning in 1882 and scheduled for completion around 2026, marking 144 years of work. The project's extended timeline is due to Antoni Gaudí's complex, nature-inspired designs, funding challenges from private donations, the loss of original plans during the Spanish Civil War. #architecture #engineering #construction #fblifestyle | Architecture