This Mysterious CIA Sculpture Has Stumped Code Breakers For 30 Years

A modern-day treasure hunt on the grounds of CIA headquarters in Langley, Virginia, has been a challenge to cryptographers for 30 years. The fourth and final piece of the puzzle remains unsolved to this day.
Published: 2:42 AM PDT July 15, 2019
Updated: 12:44 PM PDT July 12, 2019