La Sagrada Familia

La Sagrada Familia in Barcelona is architect Antoni Gaudi's life masterpiece: a soaring Gothic-inspired basilica begun in 1882 that remains under construction today, funded entirely by visitor admissions and private donations. Gaudi devoted the last 43 years of his life entirely to the project, developing complex organic forms inspired by nature, from the forest-like nave columns to the hyperbolic paraboloid roof vaulting. The church is expected to be completed around 2026, the centenary of Gaudi's death, and is already a UNESCO World Heritage Site.