At an ancient pyramid complex in Mexico dating back to the first century AD, archaeologists explore hidden tunnels beneath the temple—uncovering mysterious chambers where strange gold spheres raise provocative questions about advanced knowledge or otherworldly influence. #AncientAliens | Ancient Aliens: Out of This World Moments

In New Mexico, researchers revisit the earliest days of exploration and uncover evidence that a devastating weapon—disease—may have spread through indigenous populations with unnatural speed, possibly altering history itself. #AncientAliens | Ancient Aliens: Out of This World Moments

Beneath the jungles of Mexico, archaeologists uncover a cave hidden for centuries—one unlike any other—raising questions about a lost underground Mayan temple and the secrets it may still hold. #ancientaliens | Ancient Aliens: Out of This World Moments