Genoa is the capital of the Italian region of Liguria and the sixth-largest city in Italy. In 2015, 594,733 people lived within the citys administrative limits. As of the 2011 Italian census, the Province of Genoa, which in 2015 became the Metropolitan City of Genoa, counted 855,834 resident persons. Over 1.5 million people live in the wider metropolitan area stretching along the Italian Riviera. Located on the Gulf of Genoa in the Ligurian Sea, Genoa has historically been one of the most important ports on the Mediterranean: it is currently the second-busiest in Italy, after the port of Gioia Tauro in Calabria, and twelfth-busiest in the European Union. Genoa has been nicknamed la Superba due to its glorious past and impressive landmarks. Part of the old town of Genoa was inscribed on the World Heritage List in 2006. The citys rich cultural history in art, music and cuisine allowed it to become the 2004 European Capital of Culture. It is the birthplace of Christopher Columbus, Niccolò Paganini, Giuseppe Mazzini, and Grimaldo Canella, founder of the House of Grimaldi, among others. Genoa, which forms the southern corner of the Milan-Turin-Genoa industrial triangle of north-west Italy, is one of the countrys major economic centres. Ansaldo STS, Edoardo Raffinerie Garrone, Piaggio Aerospace and Costa Cruises.