Barcelona is a city on the shoreline of northeastern Spain. It is the capital and biggest city of sovereign network of Catalonia,as well as the second most crowded district of Spain. With a populace of 1.6 million inside city confines, its urban regionstretches out to various neighboring regions inside the Province of Barcelona and is home to around 4.8 million individuals,making it the 6th most crowded urban region in the European Union after Paris, London, Madrid, the Ruhr territory andMilan. It is perhaps the biggest city on the Mediterranean Sea, situated on the coast between the mouths of the riversLlobregat and Besòs, and limited toward the west by the Serra de Collserola mountain run, which has the tallest peak of512 meters (1,680 feet) high. Barcelona has a rich social legacy and is today a significant social focus and a significant touristgoal. Especially famous are the structural works of Antoni Gaudí and Lluís Domènech I Montaner, which have been assignedUNESCO World Heritage Sites. The central command of the Union for the Mediterranean are situated in Barcelona. Thecity is known for facilitating the 1992 Summer Olympics just as world-class meetings and compositions and furthermorenumerous global game competitions.