There’s a tunnel hidden behind Lincoln’s head on Mount Rushmore.

U.S. History

M ount Rushmore is one of America’s most iconic landmarks — but hidden behind Abraham Lincoln’s head lies a 70-foot tunnel, originally meant to house a grand Hall of Records envisioned by sculptor Gutzon Borglum. Work began in 1938 but was abruptly halted, leaving the chamber unfinished for decades — until a mysterious addition decades later quietly revived part of the dream.

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By the Numbers

Percentage of Mount Rushmore that was carved using dynamite

90%

Height (in feet) of George Washington’s head on Mount Rushmore

Did you know?

The Lincoln Memorial contains a misspelled word.

On May 30, 1922, the Lincoln Memorial was dedicated in a grand ceremony on Washington, D.C.’s National Mall. The project was an incredible investment, costing around $2 million to build (more than $36 million today). Construction lasted eight years and required 38,000 tons of marble. Despite all the time and effort, one mistake went unnoticed: The word “FUTURE” was accidentally etched into the marble as “EUTURE.” The error is found in the text of Lincoln’s second inaugural address, which is carved into the north wall of the monument. The extra line was corrected, but the slightly off-colored stone is still visible today.