We just saw National treasure today and I enjoyed the movie, it's not a great movie but it is a fun combination of action, adventure and mystery ala Indiana Jones and Goonies. Nicolas Cage plays a treasure hunter trying to solve clues left by the Freemasons 200 years ago that lead to a treasure. The movie visits Washington D.C., Philly, New York and Boston. All cities I know well having either lived near, in or visited them often. We live near Philly now and I watched the scenes filmed there and in D.C. pretty closely. The newspaper had an article with a map to the Philly locations and the Greater Philadelphia Tourism and Marketing Corporation and The Washington D.C Convention and Visitor's Bureau have teamed up to sponsor a self-guided tour to the historic sites visited in the movie you can get a brochure online at movietour.org or in Philly visit the Independence Visitor's Center. This seems like it would be a fun way to learn some history.