Today, Alyssa, Sam and I went to Mt Vernon where they are currently running tours of the basement of Mt Vernon where a crucial scene of the National Treasure movie was shot. Unfortunately they wouldn't let us photograph the basement, so here are the kids at the entrance to the basement as well as in front of the famous house.
The cornerstone with the LW engraving is certainly there, but nothing on it would move when we tried. The party scene and the river scenes in the movie were all shot locally, but the inside shots were done on a reconstructed set somewhere in Hollywood.