Find great value on US Airways flights from BWI to PHL when you book with CheapOair! The fifth populous city in the United States, Philadelphia has a typical look of colonial American cities. For some history intake make way to the Eastern State Penitentiary which is the most historic prison in America and today serves as the site of annual Bastille Day recreation. The Liberty Bell Center is a must visit site, the dramatic bell has many myths and facts ready for you to explore. Philadelphia has a dazzling nightlife with stunning places that shine after hours, enjoy great music at the Mann Music Center or at the Kimmel Center. The Franklin Institute Science Museum offers hand-on exhibits on science displays and serves as a perfect place for a family day out. Other attractions of the city include Independence National Historic Park, Fairmount Park and the National Museum of American Jewish History.