The largest city of Naples, capital of the province and the region, a point of embarkation for emigrants in the past, Naples now has a large traffic of merchandise (petroleum, carbon, cereals) and passengers. It is the largest Italian port, with a noteworthy nexus of railway and highways and a large international airport. Naples is the largest city in south Italy and one of the most beautiful, particularly around the Bay of Naples. The capital city of Campania, Naples is the third most populated city in Italy (after Rome and Milan), with over a million inhabitants, and it is the most important industrial center and trading port for the South. It is a sprawling metropolis that was founded by Greeks, enlarged by Romans and as a result is rich in history and stunning architecture. In the vast urban area one can distinguish many different neighborhoods: the old center, characterized by buildings closely crowded together, is bordered on the west by the new administrative district and on the east by the business district, into which flows almost all the road and rail traffic. Other neighborhoods, with narrow climbing streets, rise around the base of the San Martino and Capodimonte hills. These neighborhoods have experienced intense development, typically of the simpler kind, in contrast to that of the residential neighborhoods that stretch out comfortably along the Vomero and Posillipo hills.