One of the most historic cities in America, Philadelphia is an ideal place to spend a weekend - preferably a long one. Be sure to see the Liberty Bell and Independence Hall, where the Constitution and Declaration of Independence were signed. Both are part of Independence National Historic Park. Philadelphia also boasts some outstanding art museums, including the Rodin Museum. The Franklin Institute Science Museum is one of many area attractions honoring the life and work of Benjamin Franklin, the city's most famous ambassador. After digesting all of that history, be sure you save room for a classic Philly cheese steak sandwich.