The Sagrada Familia is the most visited tourist attraction in Barcelona catering to over 2,000,000 visitors a year. It is a work of immense proportions and is revered by the World of Architecture as one of the most original and ambitious modern buildings.

As you can see the building is still under construction and won't be completed for another 20 / 25 years. Construction started on the Sagrada Familia in 1882.