While the crew filmed outside the real gates, interior scenes of the palace were shot at Lancaster House in London.
The scene where Ben kidnaps the President was filmed on the east lawn of George Washington's Mount Vernon . Although the secret tunnels in the film are fictional, a basement comprised of several connecting rooms does actually exist at the estate. Trivia and Historical Context National Treasure: Book of Secrets Explained subtitle National Treasure: Book of Secrets
The literal "Book of Secrets" used in the film was a highly detailed prop that included a leather case with hand-cut lining and weathered pages. It contained specific historical "Easter eggs" for eagle-eyed viewers, such as Marilyn Monroe ’s autopsy report, blueprints for a flying saucer, and a letter from Woodrow Wilson. While the crew filmed outside the real gates,