Naples is the capital of the Italian region Campania and the third-largest municipality in Italy, after Rome and Milan. In 2015, around 975,260 people lived within the citys administrative limits. The Metropolitan City of Naples had a population of 3,115,320. Naples is the 9th-most populous urban area in the European Union with a population of between 3 million Naples is one of the oldest continuously inhabited cities in the world. Bronze Age Greek settlements were established in the Naples area in the second millennium BC. and became a lynchpin of Magna Graecia, playing a key role in the merging of Greek culture into Roman society and eventually becoming a cultural centre of the Roman Republic. Naples remained influential after the fall of the Western Roman Empire, serving as the capital city of the Kingdom of Naples between 1282 and 1816. Thereafter, in union with Sicily, it became the capital of the Two Sicilies until the unification of Italy in 1861. Naples was the most-bombed Italian city during World War II. Naples has the fourth-largest urban economy in Italy, after Milan, Rome and Turin. It is the worlds 103rd-richest city by purchasing power, with an estimated 2011 GDP of US$83.6 billion. The port of Naples is one of the most important in Europe, and has the worlds second-highest level of passenger flow, after the port of Hong Kong. Numerous major Italian companies, such as MSC Cruises Italy S.p.A, are headquartered in Naples. The city also hosts NATOs Allied Joint Force Command Naples, the SRM Institution for Economic Research and the OPE Company and Study Centre. Naples was a full member of the Eurocities network of European cities. The city was selected to become the headquarters of the European institution ACP/UE and was named a City of Literature by UNESCOs Creative Cities Network. The Villa Rosebery, one of the three official residences of the President of Italy, is located in the citys Posillipo district. Naples historic city centre is the largest in Europe, covering and enclosing 27 centuries of history, and is listed by UNESCO as a World Heritage Site. Naples has long been a major cultural centre with a global sphere of influence, particularly during the Renaissance and Enlightenment eras. In the immediate vicinity of Naples are numerous culturally and historically significant sites, including the Palace of Caserta and the Roman ruins of Pompeii and Herculaneum. Culinarily, Naples is synonymous with pizza, which originated in the city. Neapolitan music has furthermore been highly influential, credited with the invention of the romantic guitar and the mandolin, as well as notable contributions to opera and folk standards. Popular characters and historical figures who have come to symbolise the city include Januarius, the patron saint of Naples, the comic figure Pulcinella, and the Sirens from the Greek epic poem the Odyssey. According to CNN, the metro stop "Toledo" is the most beautiful in Europe and it won also the LEAF Award 2013 as "Public building of the year". Naples is the Italian city with the highest number of accredited stars from the Michelin Guide. Naples sports scene is dominated by football and Serie A club S.S.C. Napoli, two-time Italian champions and winner of European trophies, who play at the San Paolo Stadium in the south-west of the city.