Kryptos is a copper sculpture created in 1990 by American artist Jim Sanborn, located on the grounds of the Central Intelligence Agency in Langley, Virginia. It bears four encoded messages, with letters punched out of an S-shaped copper sheet, each message encrypted using a different method. To date, three out of the four parts have been deciphered, but one part remains unsolved (outlined in my version).

 

Solution to Part 1: Between subtle shading and the absence of light lies the nuance of iqlusion

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Solution to Part 2: It was totally invisible hows that possible? They used the earths magnetic field X The information was gathered and transmitted underground to an unknown location X Does Langley know about this? They should its buried out there somewhere X Who knows the exact location? Only WW this was his last message X Thirty eight degrees fifty seven minutes six point five seconds north Seventy seven degrees eight minutes forty four seconds west X Layer two [Coordinates mentioned in this section are for a point approximately 150 feet southeast of the sculpture.]

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Solution to Part 3: Slowly desperatly slowly the remains of passage debris that encumbered the lower part of the doorway was removed with trembling hands I made a tiny breach in the upper left hand corner and then widening the hole a little I inserted the candle and peered in the hot air escaping from the chamber caused the flame to flicker but presently details of the room within emerged from the mist X Can you see anything q? [Quote from Howard Carter upon opening the tomb of Tutankhamen]

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Solution to Part 4: Unknown.

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Source: Wikipedia