Philadelphia (Philadelphia) is located in southeast Pennsylvania, USA. It is one of the oldest and most historic cities in the United States. In 1790-1800, it was the capital of the United States before Washington was built. It has a very important historical position in American history. Philadelphia, nicknamed the "City of Friendship", is a place where Chinese people gather more. Philadelphia is also the fifth largest city in the United States, after New York, Los Angeles, Chicago and Houston. Philadelphia is strategically located about 160 km (2 hours drive) northeast of New York and 220 km (3 hours drive) southwest of Washington, DC. The Port of Philadelphia is one of the world's largest estuaries, with a canal that communicates the Delaware River and Chesapeake Bay, and a free trade area of about 29 hectares, with six bridges across the Delaware River and connected to towns across New Jersey. Philadelphia International Airport is located 12 kilometers southwest of the city center, and the passenger and freight volume are among the highest in the country. Philadelphia is also the first American city to be listed as a World Heritage City. The price index is not high, which is more suitable for travel and vacation. The fun places are Independence Palace, Freedom Bell, Franklin's former residence, Art Museum, Chinatown, University of Pennsylvania, etc.