Ancient Aliens — Season 21
Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the US, each episode gives historic depth to the questions, speculations, provocative controversies, first-hand accounts and grounded theories surrounding this age old debate.
Episodes
The Top Ten Extraordinary Discoveries
The Top Ten Mysterious Monoliths
The Top Ten UFO Crashes
The Top Ten Unexplained Technologies
The Top Ten Secret Projects
The Top Ten Mysterious Mountains
Mysteries of the Aztecs
The Glowing Orb Phenomenon
The Legacy of J. Allen Hynek
The Volcano Factor
The Birdman Mystery
The Abduction Files