Stay up to date on all of HISTORY's latest premieres at http://history.com/schedule On Junuary 8, 2008, hundreds of residents claimed to have seen UFOs in the sky over Stephenville, Texas in this clip from Season 2, "UFOs". #InSearchOf Subscribe for more HISTORY: ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! Massive obelisks filled with quartz were erected across the ancient world. Ancient Astronaut Theorists suggest that these ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! There are geoglyphs around the world that Ancient Astronaut Theorists believe could have encoded alien messages in this clip ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! There is a mountain in western Tibet that Ancient Astronaut Theorists believe could be a nuclear power plant used by aliens as ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! There are quartz obelisks in Egypt that some Ancient Astronaut Theorists believe were used to transmit energy over vast ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! Bolivia's stone blocks are so precise that Ancient Astronaut Theorists believe they could not have been built without advanced ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! Giorgio talks with an engineer who built a prototype to back up his theory that Puma Punku's stone blocks were actually part of ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! Finding the Ark of the Convenant could provide answers to ancient mysteries in the clip from Season 9, "Aliens and The Lost ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! Delve into the Serapeum in Egypt, where dozens of gigantic granite coffins with no clear purpose lay, in this digital exclusive ...

Tune in to Alien Invasion Week on History starting Monday 9/30 through Friday 10/4 for new Ancient Aliens, plus the premiere of In Search Of, new UFO Specials and More! The Carnac Stone are the largest collection of standing stones in the world, but nobody really knows why they were built in ...

Rabbi Ariel Tzadok reveals a possible indigenous earth spirit that’s been visiting the property through disappearing portals, in this clip from Season 2, "There's No Place Like Homestead Two." Watch all new episodes of The Secret of Skinwalker Ranch, Tuesdays at 9/8c, and stay up to date on all ...

The search continues with new episodes of In Search Of Fridays at 10/9c! Could the mythical horns that brought down the walls of Jericho actually have been alien technology? Ancient Astronaut Theorists say "yes" in this clip from Season 8, "Mysterious Devices". #AncientAliens Subscribe for more ...