Kryptos is a cryptic sculpture located at the Central Intelligence Agency (CIA) headquarters in Langley, Virginia, created by artist Jim Sanborn. Unveiled in 1990, the sculpture features four encrypted messages carved into the copper plates. The first three sections have been deciphered by enthusiasts, but the fourth remains unsolved, making it one of the most famous unsolved codes in the world. The artist has provided clues, and the CIA has even used the puzzle as a recruitment tool. The mystery of Kryptos has sparked widespread interest and continues to challenge codebreakers and puzzle enthusiasts globally.