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.
Across continents and cultures, remote caves, mountains, and subterranean labyrinths have long been regarded as secret refuges—hidden homes of gods, giants, and beings not entirely human.