Mount Rushmore is one of the treasures of the United States, and arguably the best and most popular attraction of South Dakota. The monument itself is absolutely massive, and it took many days and millions of dollars to complete. The sheer manpower that was needed to blast and chisel the rock away reached nearly 400 men. Over the 14 years, it took to complete the project, the men of the mountain unified not only to create one the most historic sculptures on US soil, but also a sports team–their story is unique.

Many people know the basic information about the site from either history class, or from traveling to it first hand, but few know about the secrets hidden within the creation and construction of the hidden room behind the mountain. It’s best seen from aerial view because of the steep and secluded location of the room. The original designs must have been for a special purpose, right? After all, funding wouldn’t be allocated to a room that the investors didn’t think was necessary…

There have been rumors and myths about the origin of the room as well as what it’s used for today, and we’re here to help solve those. The room is under surveillance most of the time, but luckily we’ve put together a list of pictures that help you get a first-hand experience into the mystery behind Mount Rushmore, as well as a detailed history behind the masterpiece created more than 60 years ago.

25. Mount Rushmore

South Dakota is famous for the massive monument that is carved into Mount Rushmore in the Black Hills region in Keystone. The giant 59-foot sculpture was created by US artist and sculptor John Gutzon de la Mothe Borglum and his son Lincoln over a 14-year span starting in 1927. It features four US presidents covered with granite: Abraham Lincoln, George Washington, Thomas Jefferson, and Theodore Roosevelt.