The Pyramid of Khufu is an engineering marvel, but its origins remain unknown, leaving Theorists to believe otherworldly gods might've had a hand in its construction, in this clip from Season 5, "Secrets Of The Pyramids." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up ...

All around the world, archaeologists have uncovered mysterious relics revered by ancient cultures for thousands of years. See more in Season 6, Episode 8, "Mysterious Relics." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The ...