The Hidden Room Behind Mount Rushmore

(via mental_floss) In the 14 years he spent planning, sculpting, and overseeing the completion of the Mount Rushmore monument, artist Gutzon Borglum harbored a deep concern. He worried that his creation—one that used a 400-foot-long by 500-foot-wide rock canvas to depict the faces of four influential U.S. presidents—would one day be shrouded in mystery. Borglum announced an ambitious addition: a room situated just behind Lincoln’s hairline containing all the info anyone would need about the mountain… even major historical artifacts like the Constitution and the Bill of Rights.