Revisit the most compelling mysteries explored over the past 15 years of "Ancient Aliens." Experts like Giorgio Tsoukalos, David Childress, William Henry, and Jason Martell engage in conversations around Ancient Astronaut Theory in each episode.
Peabody Award winner Linda Moulton Howe and other experts explore the enigma of the colossal stone pyramids encircling our planet, both their purposes and the incomprehensible technology behind their creation.