Sao Paulo is the largest city in South America and the third more populous city of the world, with more than 10 million inhabitants. It is the economical capital of Brazil and a very busy place. It is also rich in culture parks and museums.Sao Paulo is centered around the Praça da Se, where there is a stone mark symbolizing the "point zero" of the city. The subway system is clean and efficient but covers only a few areas of the city, although extensions are being made. Interesting neighbourhoods to visit include Jardins, Itaim and the Ibirapuera Park.