Behind which president is there a hidden chamber at Mount Rushmore?

After its completion in 1941, the colossal presidential sculpture carved into Mount Rushmore quickly became an American icon. However, few know that hidden behind the hairline of Abraham Lincoln is a doorway to an unfinished chamber originally intended to hold some of America’s most treasured documents.

On Halloween in 1941, the 14-year effort to carve the enormous profiles of four American presidents of George Washington, Thomas Jefferson, Abraham Lincoln and Theodore Roosevelt into the southeastern face of Mount Rushmore was finally completed. However, one little-known, but critical, element of Danish-American sculptor Gutzon Borglum’s “Shrine of Democracy Sculpture” was left unfinished and remains concealed from view behind Lincoln’s mighty brow.

Carved into the solid granite wall of a small canyon running right behind the presidential lineup is an 18-foot-tall doorway that resembles the entrance to an ancient tomb of an Egyptian pharaoh.