Kryptos is a mystery that a sculpture in Washington D.C. holds a secret message on it. A lot of people have tried to figure out what that secret message is but no one has been able to crack it. The message is made up of four different parts and each part so far has been decoded. There are still two more parts that are not solved and the people who are trying to figure it out are called "codebreakers". They are working hard to try and figure out what the secret message is and they won't give up until they do!