Ancient Aliens: Season 21, Episode 6

21 - 6: The Top Ten Mysterious Mountains

Ancient Aliens is counting down ten mysterious mountains that are notorious for otherworldly phenomena.  From a summit in Sri Lanka that is said to be a portal to other worlds, a volcano in Washington that was at the center of a famous UFO sighting, and a mesa in New Mexico believed to contain an alien base, could these strange peaks provide evidence of extraterrestrial contact?