It might be strange that a not even finished building is among the most famous buildings in the world, but the Sagrada Familia belongs in the list for a couple of good reasons. It is a master-piece in progress, and one of Spains most visited tourist sites. It’s a design by Antoni Gaudi, who worked on this project for almost 40 years, until his death in 1926. Construction on the cathedral began in 1882 and still has not finished yet. It will have 18 towers, of which the central tower of Jesus wil be the tallest of them all with 170 meters. When finished this will be the pièce the résistance of an artist who already left a huge artistic footprint in Barcelona.