National Constitution Center
This is the museum dedicatd to the U.S. Constitution in which you can even see a theatrical play about what happened during it's writing and signing.
There's a very interesting room in which they make little figurines in bronze of all the famous people who worked on the Constitution.
The exhibit, called "Freedom is Calling" is a whole array of different models, lights and colors to make the citizens conscious of the importance of the constitution.
Opposite that, there tends to be little set ups in the part below it. As I write this (March 2012), the set up is dedicated to Bruce Springsteen.