Kryptos

Hidden in an interior courtyard at CIA headquarters is a massive coded sculpture known as Kryptos. The cryptic statue's wavy bronze scrolls stand twelve feet high, overlooking a clockwise circular whirlpool and sandstone etched with a compass pointing due north. Perhaps the world's most famous unsolved puzzle, the deciphered text so far presents a riddle, referring to a treasure "buried out there somewhere," and the code letters WW and Q. 

The significance of these letters is believed by an enlightened few to signify far more than even the sculptor/code maker Jim Sanborn was aware. 

It is believed that whoever solves the meaning behind WW's Q first will decide the fate of our world itself.