You may be familiar with Mount Rushmore, whether you know the history behind it or whether you have just caught a glimpse of it on a cartoon, it is arguably one of the biggest and most well known statues in the world.

Mount Rushmore National Memorial was carved into the Black Hills in Keystone, South Dakota. It features the heads of four prolific U.S. presidents: George Washington, Thomas Jefferson, Theodore Roosevelt and Abraham Lincoln.

What you may not be aware of however, is the secret room which lies behind those giant carvings. Here is everything you need to know about the hidden lair..

image source: Fox

Behind The Scenes

image source: meme

The carvings were initially commissioned to help bring tourism to the Black Hills region of South Dakota and work commenced in 1927. The intricate work took 14 years to complete, ending in 1941.