National Treasure Wiki

The Buckingham plank

The Library of Congress plank

Wood Carving is what the French Statue of Liberty clue says to find. The wood carving used to be in one piece but it was broken in two and hidden in the twin Resolute Desks. One in the Oval Office in the White House, and the other in Buckingham Palace. The wood carvings lead to the Lost City of Gold.

White House desk wood carvings is missing, and a clue is left behind for the Book of Secrets. The Book of secrets describes the finding of the wood carving and the destruction of it, fortunately it has a photograph taken of it. The wood carvings lead to Mount Rushmore.

Emily Appleton Gates was the one who was able to translate the carvings: