Summary. Barcelona, the romantic the capital City of Catalonia, is the home of the Sagrada Familia, FC Barcelona, beautiful Mediterranean beaches and much more. Barcelona is where Catalan architect, Antoni Gaudí, left his mark. Gaudí's unique style is featured all over the City including Park Gruell and the Sagrada Familia, which collectively are a UNESCO World Heritage Site. Barcelona has a great Metro system so there's no need to spend the money on accommodations in touris