Watch Ancient Aliens Season 21 online

Ancient Aliens

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Episodes

  1. The Top Ten Extraordinary Discoveries

    1. The Top Ten Extraordinary Discoveries

    Ancient Aliens is counting down ten of history's most astonishing discoveries – breakthroughs that challenge traditional beliefs about human history. From a lost city hidden in the Andes to mysterious metal spheres that are not of this world and a sunken city that was said to be the home of the gods, could these discoveries provide proof of extraterrestrial contact?

  2. The Top Ten Mysterious Monoliths

    2. The Top Ten Mysterious Monoliths

    Ancient Aliens is counting down the world's top ten most mysterious monoliths, from a 500-ton stone believed to represent an ancient UFO, to giant statues said to have been created with advanced technology, and ornate pillars that depict otherworldly visitors. Could these extraordinary standing stones provide evidence of extraterrestrial visitation?

  3. The Top Ten UFO Crashes

    3. The Top Ten UFO Crashes

    Ancient Aliens is counting down ten of the most compelling UFO crashes that have been reported across the globe. From an acorn-shaped object that crashed in the woods of rural Pennsylvania, to a mysterious craft that washed ashore in Japan, and an earth-shaking impact in Britain that defies explanation, are these mysterious events proof that our planet has been visited by extraterrestrials?

  4. The Top Ten Unexplained Technologies

    4. The Top Ten Unexplained Technologies

    Ancient Aliens is counting down ten of the most astonishing--and unexplainable--technologies in history. From mysterious golden orbs discovered in Mexico, to a sacred wooden box that could communicate with the heavens, and an ancient tomb that is said to depict an astronaut, might these sensational artifacts be evidence of otherworldly contact?

  5. The Top Ten Secret Projects

    5. The Top Ten Secret Projects

    Ancient Aliens is counting down ten of history's most compelling -- and covert -- projects that study the UFO phenomenon. From clandestine government organizations to agents that silence UFO witnesses and secret programs to reverse-engineer alien technology, are these mysterious projects evidence of contact with extraterrestrials?

  6. The Top Ten Mysterious Mountains

    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?

  7. Mysteries of the Aztecs

    7. Mysteries of the Aztecs

    The Aztecs built one of the world's most powerful and feared empires, and they claimed that they were guided by a pantheon of more than a thousand gods who came to Earth from different parts of the universe. Could the incredible story of their rise to power – and their sudden demise – reveal a history of extraterrestrial intervention in Mesoamerica?

  8. The Glowing Orb Phenomenon

    8. The Glowing Orb Phenomenon

    Across the globe, reports of mysterious glowing orbs are on the rise. Their movements frequently defy the laws of physics, and now they are even being reported near military bases, ships, and nuclear weapon facilities. Do they represent a non-human intelligence? And if so, why are they here?

  9. The Legacy Of J. Allen Hynek

    9. The Legacy Of J. Allen Hynek

    Dr. J. Allen Hynek is best known as the notorious government UFO debunker who became one of the founding fathers of ufology. Was Dr. Hynek right when he ultimately concluded that there is a non-human intelligence on Earth?

  10. The Volcano Factor

    10. The Volcano Factor

    Volcanoes are Mother Nature's most fearsome and volatile creation. They have inspired countless myths and legends, but curiously, they are also major hotspots for UFO sightings.

  11. The Birdman Mystery

    11. The Birdman Mystery

    Throughout the ancient world, there are depictions of mysterious figures that appear to be half human and half bird. In many cultures, they are revered as divine and have magical abilities.

  12. The Abduction Files

    12. The Abduction Files

    All over the world, there are people who claim they have been abducted by aliens. Since the 1970s, a growing number of researchers have dedicated their lives to uncovering what is behind this disturbing phenomenon.

  13. The Giants

    13. The Giants

    Thousands of years ago, people all over the world described encounters with enormous, human-like beings, and some archaeologists even claim to have found skeletons of extraordinary size. Could it be that the giants of myth and legend, truly existed?

  14. Aliens In Our Midst

    14. Aliens In Our Midst

    In the age of smartphones and social media, more evidence of otherworldly activity has come to light than ever before. From a giant "shadow monster" witnessed outside a Miami mall to reports of ET encounters in Las Vegas.

  15. Britain's UFO Files

    15. Britain's UFO Files

    From ancient sites like Stonehenge to the crop circle phenomenon and modern-day UFO sightings, Great Britain is a place of countless mysteries. Could it be that throughout history, this island has been a destination for extraterrestrial visitors?

  16. Mysteries Of The Norse Gods

    16. Mysteries Of The Norse Gods

    The ancient legends of the Norse read like modern science-fiction, with powerful gods wielding incredible weapons and high technology. Could it be that these mythological tales are based on real encounters with extraterrestrial beings?

  17. Secrets Of Japan

    17. Secrets Of Japan

    Japan is a land rich with ancient mysteries, and recently, it has also become known as a UFO hotspot. Could it be, as Ancient Astronaut Theorists suggest, that this island nation has a long history of extraterrestrial activity?