Verona ( və-ROH-nə, Italian: [veˈroːna] (listen); Venetian: Verona or Veròna; historical German: Bern, Welschbern, or Dietrichsbern) is a city on the Adige river in Veneto, Italy, with 258,108 inhabitants. It is one of the seven provincial capitals of the region. It is the second largest city municipality in the region and the third largest in northeast Italy. The metropolitan area of Verona covers an area of 1,426 km2 (550.58 sq mi) and has a population of 714,274 inhabitants. It is one of the main tourist destinations in northern Italy because of its artistic heritage and several annual fairs, shows, and operas, such as the lyrical season in the Arena, an ancient Roman amphitheater. Two of William Shakespeare's plays are set in Verona: Romeo and Juliet and The Two Gentlemen of Verona. It is unknown if Shakespeare ever visited Verona or Italy, but his plays have lured many visitors to Verona and surrounding cities. The city has been declared a World Heritage Site by UNESCO because of its urban structure and architecture.