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Barcelona is the capital and the most populous city of Catalonia and the second largest city in Spain, after Madrid. Gràcia is a district of the city of Barcelona. The most well-known attraction in Gràcia is the Gaudí-designed Parc Güell which is located on El Carmel mountain. Casa Vicens, Gaudí's first important work and a UNESCO World Heritage Site, is also located in Gràcia.