Two pyramids located on two different continents share uncanny features. See more in this clip from "Aliens and Unexplained Engineering." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and next day on The HISTORY Channel website at http://history.com/schedule. #AncientAliens ...

A fascinating photo released to the public shows a UFO hovering over Stonehenge. See more in this clip from "Aliens and Unexplained Engineering." Watch all new episodes of Ancient Aliens, Fridays at 8/7c, and next day on The HISTORY Channel website at http://history.com/schedule. ...