Johannesburg is the capital of the Gauteng province and the financial hub of South Africa. Founded in 1886, the city is located in the Witwatersrand region, which has vast gold deposits. The town experienced rapid growth as the gold deposits were exploited, and is now South Africa's largest urban center. As a result, the Johannesburg area has a wide variety of architecture, from early Art Nouveau to Postmodern buildings. Hillbrow, for example, contains many buildings constructed since the 1950s, including the Hillbrow Tower.