National Treasure Wiki
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Map of Mount Vernon is a map penned by George Washington after he had obtained the Mount Vernon estate.

The map was passed down to Benjamin Franklin Gates by his great Uncle, who got it from a granddaughter of a slave, Charlotte who lived and worked at Mount Vernon.

In 2007, Benjamin Franklin Gates used this map and current President's interest in architecture to lure him into the hidden tunnels to ask about the Book of Secrets.