A theoretical physicist at the University of Connecticut shares his prototype for a large time machine that extraterrestrials could’ve also used, in this clip from Season 4, "The Time Travelers." Watch all new episodes of Ancient Aliens, returning soon, and stay up to date on all of your ...

Sacred tales of the ancient world may provide new clues to the oldest records of time travel ever experienced, in this clip from Season 4, "The Time Travelers." Watch all new episodes of Ancient Aliens, returning soon, and stay up to date on all of your favorite The HISTORY Channel shows at ...