Philadelphia is the vast city in the Commonwealth of Pennsylvania. In the North-eastern United States, at the confluence of the Delaware and Schuylkill rivers, Philadelphia is the economic and cultural mainstay of the Delaware Valley and the eighth-largest combined statistical area in the United States. Philadelphia is the fifth-most populous city in the United States.

In 1682, William Penn founded the city to be as capital of the Pennsylvania Colony. In the 19th century, Philadelphia became the railroad hub that grew from an influx of European immigrants and also a major industrial centre. It became a main destination for African-Americans in the Great Migration.

The city is known for its culture, history and art attracting over 39 million domestic tourists in 2013. The area's many universities and colleges make Philadelphia a prime international study destination, and also as the city have evolved into an economic hub and educational. The 67 National Historic indicators in the city helped account for the $10 billion generated by tourism. Philadelphia has more murals and outdoor sculptures than any other American city, and Fairmount Park is the largest landscaped urban park in the world. Philadelphia is the only World Heritage City in the United States. Philadelphia is the home of many U.S. firsts, including the first library first hospital and medical school, first Capitol, first stock exchange, first zoo and first business school and also the birthplace of the United States Marine Corps.