Pittsburgh is a city in the west of Pennsylvania, located at the confluence of three rivers. During the Gilded Age and early 20th century, Pittsburgh was considered the industrial capital of the United States. It was then that the Carnegie Natural History Museum, the Carnegie Art Museum, the greenhouse and the Phipps botanical gardens were founded. On the north bank are the modern Andy Warhol Museum, the Heinz Field football stadium and the PNC Park baseball arena. The population is 300 000 people.