The iconic Lincoln Memorial on the National Mall in Washington, DC, is chock full of symbolism and details for eagle-eyed observers to discover. Dedicated on this day in 1922, the landmark has 36 columns, representing each of the states in the Union at the time of Lincoln’s death. The president’s pose was designed to represent both his strength and compassion (one fist is clenched, the other at rest), and even the building materials were sourced from locations significant to his life and legacy. Look closely at the inscription on the wall of the north chamber and you’ll even spot a typo in the text of Lincoln’s second inaugural address, where the sculptor carved ‘EUTURE’ instead of ’FUTURE.’ Oops! The inscription has since been corrected, but the original mistake remains discernable.