The Architectural Wonders of Gaudi 
Barcelona has several noteworthy places where the works of architectural genius Antoni Gaudi can be seen. The Parc Guell and the Padrera are good choices but the most popular is his signature achievement, the Sagrada Familia.
The Sagrada Familia was begun in Barcelona in 1882 by public subscription. A year later Gaudí became director of the project, a post he would hold for 40 years until his death in 1926.
After the completion of ParcGüell in 1911, he vowed that his architecture would not be devoted to secular aims. His commitment to this project is indicated as well by the fact that he lived in a studio on the site.Other architects continued with the work after his death in 1926, until the towers of the facade were completed.
Work continued on the Sagrada Familia based on Gaudí's general plan and studies. It survived the Spanish Civil war and today is seen as a kind of symbol for the city of Barcelona. It is sometimes called Barcelona's third cathedral. It is still unfinished today (note the cranes and scaffolding in various photographs above) and is scheduled for completion in 2025. It is a combination of Modernista elements and a unique version of the Gothic style--seen primarily in its height, use of rose windows and arches, triple portals, and architectural sculpture.
The cost of an individual tour is 11 euro; a guided tour is 15 euro. A lift up the towers is extra.