Kryptos

Code breaking is one of those fields where I have a deep sense of respect for those that can do it while, never the less, being painfully aware that my own talents don't lend themselves to it.

As such, it makes me feel a little better that there are codes that even the professionals haven't worked out. One of the more interesting cases is on the grounds of the CIA headquarters in the form of a scuplture named Kryptos. Wired news has the very fascinating story behind it.