Old City is a neighborhood in Center City, Philadelphia. It is in the eastern part of Center City near the Delaware River. It contains many famous historic buildings from the Revolutionary Era. The most famous building is Independence Hall. It is a UNESCO World Heritage Site and part of the Independence National Historical Park. The Indepence Hall is where the Declaration of Independence and the US Constitution were written and signed. The famous Liberty Bell is also part of this national park. The Old City Historic District is in Old City. It includes many other historic buildings like Carpenter's Hall, Betsy Ross House and Elfreth's Alley. Christ Church is a famous historic church building. The neighborhood is also the oldest part of Philadelphia. It is where William Penn and Quakers settled.