Please provide an introduction to Kryptos here, with this same subject line, to act as a summary of everything discussed in this thread. Once someone has created this post, we will pin it to the top of the thread and delete this one. Whoever creates the initial post will be responsible for updating it with any additional useful information provided in the thread. (If this person wishes to "hand off" this duty to someone else at some point, please PM us and we will make the necessary updates.)
We suggest this section also include other clues left around the CIA headquarters that do not pertain to a specific panel in the sculpture, such as the Morse code.