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Watch Ancient Aliens Season 21 Episode 2 Online

  • 6.894/10
  • COUNTRIES: United States of America
  • Subtitles: English

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?