(CNN)In the middle of CIA headquarters, there sits a sculpture that contains a secret code that has stumped top cryptologists for decades.
In the late 1980s, artist Jim Sanborn was commissioned to create a sculpture to be displayed at CIA headquarters in Langley, Virginia. Knowing some of the world’s top intelligence officials would see the piece practically every day, Sanborn made a work of art that is, in a word, puzzling.
Unveiled on November 3, 1990, it’s called Kryptos, and it contains a cryptographic challenge. Surely, someone would crack the code in just a couple of weeks, Sanborn thought.