Putting art, a puzzle, and encyption together. You got Kryptos. There's a fog of mystery surrounding it; It's stand on the CIA (yes, _the_ CIA) HQ in Langley, Virginia. Section of the message contains some KGB document (I guess it's declassifed now?). Many are working on it and yet to solve the last part. Even the populer The Da Vinci Code refers to it.

Wired News: Solving the Enigma of Kryptos

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