7. Sao Paulo

Population: 20,900,000
Country: Brazil

Sao Paulo is the largest city in Brazil. It is the capital of the Southeastern state of Sao Paulo, and also a beehive of activity that offers a jovial nightlife and an intense cultural experience. Sao Paulo is one of the richest cities in the southern hemisphere. A large sprawling city can present numerous challenges to sensibilities. Although the first impression might be that of a grey concrete jungle, soon it becomes apparent that the city has a great number of pockets of beauty. The population and environment of Sao Paulo is diverse, and districts within it range from extremely luxurious areas to hovels housing the poor and destitute, located usually in suburbia far from the so-called "expanded center".