Megalithic monuments linked together by electromagnetic energy... Prehistoric ruins arranged across vast distances in straight lines... And advanced mathematics carved into landmarks more than 5000 years ago. See more in Season 1, Episode 14, "Stargates and Secret Messages." Watch full ...

Researchers in Chicago come to the conclusion that the sophistical of the human brain isn’t just a result of evolution. See more int his clip from Season 1, Episode 4, "Human Genesis." Watch full episodes and stay up to date on all of your favorite shows on The HISTORY Channel website at ...

Many of humanity's most significant turning points have bore witness to unexplainable events. Is this merely coincidence, or could it be evidence that the course of human history is being manipulated by an alien agenda? See more in Season 9, Episode 12, "The Alien Agenda." Watch full episodes ...

Check out these shocking human theories. See more in this Ancient Aliens compilation. Ch1 - 0:00 - The Visitors Ch2 - 5:26 - The Time Travelers Ch3 - 8:23 - Race Against Time Ch4 - 15:13 - Humans and Aliens Watch full episodes and stay up to date on all of your favorite shows on The HISTORY ...

The government reveals big secrets when they unveil their new UFO program. See more in this clip from Season 21, Episode 5, "The Top Ten Secret Projects." Watch full episodes and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

Check out these secret Egyptian mysteries. See more 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 Subscribe for ...

Researchers and theorists debate the origins of humans but make a shocking discovery. See more in this clip from Season 1, Episode 4, "Human Genesis." Watch full episodes and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

On March 19th, 2002, Gary McKinnon was arrested for hacking into 97 Pentagon and NASA computers over a 13-month period, in what authorities call the "biggest military computer hack of all time." See more in Season 10, Episode 9, "The Alien Wars." Watch full episodes and stay up to date on all ...

Check out these otherworldly discoveries. See more in this Ancient Aliens compilation. 1. Forbidden Caves 0:00 2. Underground Aliens 5:45 3. Forbidden Caves 2 12:05 4. Underground Aliens 2 Watch full episodes and stay up to date on all of your favorite shows on The HISTORY Channel website ...

This mysterious mountain in central Sri Lanka is known as a UFO hotspot for various reasons. See more in this clip from Season 21, Episode 6, "The Top Ten Mysterious Mountains." Watch full episodes and stay up to date on all of your favorite shows on The HISTORY Channel website at ...

Ancient astronaut theorists believe that the Sumerian people of Iraq were visited by an alien race depicted in clay tablets. See more in this clip from Season 1, Episode 4, "Human Genesis." New Season Fri., Feb. 7 at 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on ...

Due to warfare, instability, and inaccessibility--there are specific regions of the world that are off-limits to exploration. See more in Season 10, Episode 10, "The Forbidden Zones." Watch full episodes and stay up to date on all of your favorite shows on The HISTORY Channel website at ...