Josh Gates searches Mexico for clues behind the mysterious rise and disappearance of Teotihuacan, a powerful civilization that predated the Aztecs in Mesoamerica. His search takes him under the largest pyramid in the world and to a dangerous mine that could explain their influence.

Josh Gates travels to Europe to expose the last secrets of the Nazi empire. He searches for a buried train filled with stolen gold, explores the tunnels of the notorious Project Riese and hunts for a lost fortune at the bottom of a lake.