Philadelphia, also known as the City of Friendship, is located between the US political center of Washington and the economic center of New York. It is the oldest and most culturally rich city in the United States and a charming city in the eastern United States. . Before Washington was established, Philadelphia was once the short-lived capital of the United States; this city has important significance in the history of the United States. For tourists, the term Philadelphia stands for Liberty Bell, quaint streets, and classic delicacies. Outside the Independence Hall in Philadelphia, stands a modern clock tower, with the famous saying above, "Declaring freedom to all the people of the world", together with the world's most famous clock. It witnessed the United States. The rise and fall of two centuries and development. Liberty Bell is located here for hundreds of years, becoming a symbol of freedom and a historical testimony of the country's independence. Liberty Bell, and the Independence Palace are located in the Philadelphia National Independence Historical Park. Surrounded by a green environment, the detached building is a great place to learn about American history.