Designed by architect Antoni Gaudí, his work on Sagrada Família is part of a UNESCO World Heritage Site. Construction began in March of 1882 and is estimated to be completed in 2026. Gaudí designed the interior columns to resemble trees and branches. Essentially none of the interior surfaces are flat; the ornamentation is comprehensive and rich, consisting in large part of abstract shapes which combine smooth curves and jagged points. Even detail-level work such as the iron railings for balconies and stairways are full of curvaceous elaboration. The way that the light plays on the different surfaces is extraordinary!