These giant creatures could have been walking among us. See more in this Ancient Aliens compilation. 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 ...

The vast Alaskan wilderness is well known for mysterious disappearances, electromagnetic anomalies, stories of strange creatures, and is a hotspot for UFO sightings. Could Alaska's many mysteries be due to a presence that is not of this world? Find out in this clip from Season 19, Episode 8, ...

Was this CIA member killed because he wasn't supposed to see something at the base of Mt. Hayes in Alaska? See more in this scene from Season 19, Episode 8, "The Mysteries of Alaska." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. ...