If extraterrestrials influenced human history, can evidence of their existence be found in hidden tunnels and caverns around the world? See more in Season 2, Episode 4, "Underground Aliens." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at ...

These colossal statues are more than just statues, they may have connections to another world. See more in this scene from Season 2, Episode 10, "Alien Effigies." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel ...

Discover Antarctica's secret past in this compilation from Ancient Aliens. Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from Ancient Aliens and other great The HISTORY Channel shows: ...

Here's The REAL REASON Why ALIENS Haven't Been Found Yet Subscribe To Most Amazing Top 10: http://bit.ly/2Ibyk6i Most Recent Videos: https://www.youtube.com/watch?v=Pj2rni0BfKo&list=UUBINYCmwE29fBXCpUI8DgTA 👽 Curious about why we haven't found aliens yet? 🌌 Join us as we dive into the REAL ...

Across the globe, monumental stone figures silently bear witness to a forgotten era. See more in Season 2, Episode 10, "Alien Effigies." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from ...

Across the globe, there are remarkable ruins, statues and carvings that appear to connect diverse ancient civilizations to one another. See more in Season 1, Episode 12, "The Global Connection." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your ...

Unlock the secrets of ancient wisdom and enigmatic civilization in this Ancient Aliens compilation. Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. #AncientAliens ...

Ancient Astronaut Theorists have found compelling similarities between Mount Shasta and the Great Pyramid that explain the purpose they've served, in this clip from Season 17, "The Mystery of Mount Shasta." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all ...

Some of these petroglyphs make experts wonder if they were created because of extraterrestrials. See more in this scene from Season 1, Episode 12, "The Global Connection." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The ...

How did these hieroglyphics end up in Australia? See more in this scene from Season 1, Episode 12, "The Global Connection." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at ...

Unravel the mystery of crop circles, from time travel to secret messages in this Ancient Aliens compilation. Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

Across the globe, there are remarkable ruins, statues and carvings that appear to connect diverse ancient civilizations to one another. See more in Season 1, Episode 12, "The Global Connection." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your ...