Ancient Aliens: Season 19, Episode 11

19 - 11: The Top Ten Pyramid Sites

Ancient Aliens is counting down the world's top 10 pyramid sites, from a valley in Peru with over 250 hidden pyramids to an ancient Greek city with mysterious 4,800-year-old ruins to Egypt's famous Giza Plateau... Could the extraordinary structures that stand at these sites provide evidence of extraterrestrial visitation?