Rome is the capital of Italy and the country's largest and most populated city and comune, with over 2.7 million residents in 1,285.3 km2 (496.3 sq mi). Rome's metropolitan area is the second largest in Italy Milan, with some 3.7 million residents. The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy. The historic centre of the city is a UNESCO World Heritage Site. With wonderful palaces, millennium-old churches, grand romantic ruins, opulent monuments, ornate statues and graceful fountains, Rome has an immensely rich historical heritage and cosmopolitan atmosphere, making it one of Europe's and the world's most visited, famous, influential and beautiful capitals.