From the strict, brutal codes of Hammurabi and the Samurai to the secretly malevolent evil eye and Voodoo dolls, history is full of remarkable stories of acts committed in the name of revenge. We uncover the dark forces that have driven individuals and nations to seek vengeance--often with deadly consequences.

For centuries, secret codes have been embedded in sacred texts, ancient paintings, and even etched into the earth itself. Were they left as clues, warnings or something far more profound? In this episode, we uncover the fascinating stories behind these cryptic messages, those who endeavored to decipher them, and the secrets they may still be trying to reveal.