Philadelphia, Pennsylvania was pivotal in creating our new United States. Visiting the places where Franklin, Jefferson and other founders met is awe-inspiring. No visit would be complete without seeing the Liberty Bell and Independence Hall. But be prepared. To protect these National treasures the security is high. It's very similar to Airport security measures so factor this into your visit.
A good place to start, of course, is the visitor's center to get oriented and a timed entrance ticket for the Independence Hall tour. Although these attractions are free they are organized from this location.
Do spend some time reading panels and plaques for a complete story and don't miss Benjamin Franklin's Burial Plot just down the street and the site where Thomas Jefferson completed the Declaration of Independence. Everywhere you turn in Philadelphia, History winks back!