Learn more about the CIA's uncrackable code in the latest episode of Great Big Story, a new podcast from CNN about the delightful, surprising stories all around us. 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. But no one did. And, today, Kryptos remains one of the world's most famous unsolved mysteries. "I didn't think it would go on this long -- thirty years -- without being deciphered," Sanborn says. Krypto...
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