It's not exactly "National Treasure: Book of Secrets," but South Dakota's famous Mount Rushmore does have a bit more going on than meets the eye. In the 2007 movie, Benjamin Franklin Gates, played ...

A hidden vault behind Lincoln's head at Mount Rushmore holds important U.S. documents, but this secret room is closed to the public except for a lucky few.

It's not exactly "National Treasure: Book of Secrets," but South Dakota's famous Mount Rushmore does have a bit more going on than meets the eye. In the 2007 movie, Benjamin Franklin Gates, played by ...

One of America's most iconic landmarks, Mount Rushmore holds a hidden secret. While most know it depicts four former US Presidents, few realize architect Gutzon Borglum had a much grander vision.

The hidden chamber is sealed off to the public. On Halloween day 1941, the 14-year long effort to carve 18-meter (60-foot) tall faces into the side of Mount Rushmore was finally completed.

But for all of Mount Rushmore's widespread fame (and over 2 million annual visitors), it's also a place with a deep history and a long list of little-known facts that may surprise even the most ...

The concept for Mount Rushmore was proposed by historian Doane Robinson in 1923 as a bold way to draw tourists to the state ...

It's not exactly "National Treasure: Book of Secrets," but South Dakota's famous Mount Rushmore does have a bit more going on than meets the eye. In the 2007 movie, Benjamin Franklin Gates, played by ...

It's not exactly "National Treasure: Book of Secrets," but South Dakota's famous Mount Rushmore does have a bit more going on than meets the eye. In the 2007 movie, Benjamin Franklin Gates, played by ...

That's all to say, though, that although there aren't tunnels crisscrossing behind the heads of the presidents on Mount Rushmore, there is one, incomplete chamber hiding behind Abraham Lincoln's head.