Ancient astronaut theorists believe that the ancient Egyptian tombs of early leaders served a more extraterrestrial purpose, and sacred texts hold all of the answers, in this clip from Season 5, "Secrets of the Tombs." Watch all new episodes of Ancient Aliens, returning soon, and stay up to date ...

In Shaanxi Province, China, farmers made an astonishing discovery of a massive underground mausoleum home to Emperor Qin Shi Huang's remains, in this clip from Season 5, "Secrets of the Tombs." Watch all new episodes of Ancient Aliens, returning soon, and stay up to date on all of your favorite ...