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Barcelona  is the capital city of the autonomous community of Catalonia in Spain, and the second largest city in the country, with a population of 1,620,943 within its administrative limits. The urban area of Barcelona extends beyond the administrative city limits with a population of around 4.5 million, being the sixth-most populous urban area in the European Union after Paris,London, the Ruhr, Madrid and Milan. About five million people live in the Barcelona metropolitan area. It is the largest metropolis on theMediterranean Sea, located on the coast between the mouths of the rivers Llobregat and Besòs, and bounded to the west by the Serra de Collserolamountain range, the tallest peak of which is 512 metres (1,680 ft) high. Founded as a Roman city, in the Middle Ages Barcelona became the capital of the County of Barcelona. After merging with the Kingdom of Aragon, Barcelona continued to be an important city in the Crown of Aragon. Besieged several times during its history, Barcelona has a rich cultural heritage and is today an important cultural centre and a major tourist destination. Particularly renowned are the architectural works of Antoni Gaudí and Lluís Domènech i Montaner, which have been designated UNESCO World Heritage Sites. The headquarters of the Union for the Mediterranean is located in Barcelona. The city is known for hosting the 1992 Summer as well as world-class conferences and expositions and also many international sport tournaments.