The National Treasure Tour is dedicated to the behind-the-scenes filming of the blockbuster movie "National Treasure 2: Book of Secrets" at Mount Vernon. This popular tour combines Hollywood and history, giving visitors stories about the filming and also information on how the locations were used during George Washington's time. Included in this approximately hour-long walking tour is the Mansion's basement and cornerstone, the setting for a pivotal scene. Fans of the movie will recognize the space as the location where Nicolas Cage's character kidnaps the president. This special tour costs $5 per tour in addition to estate admission.