When we speak of the «center of Barcelona«, We refer to this area, that is, the Plaza de España and its surroundings. It is one of the most representative spaces of the Catalan capital, built during the 1929 International Exposition. It is the second largest square in Spain with its 34 m² of extension, after that of Madrid. You have all the information in: «Barcelona tourist guide«.
You have all the information in: "Barcelona tourist guide".