Ancient cultures throughout the Mediterranean recorded stories of enormous beings that descended from the sky. Could massive megalithic structures and reported discoveries of towering human-like skeletons reveal that this part of the world was once inhabited by giants?

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We’re counting down the world’s top ten alien encounters, from the first reported abduction event to mass UFO sightings over New York’s Hudson Valley to an incident in ancient Rome that changed the course of human history. Could these incredible accounts be actual encounters with visitors from the stars?

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The mysterious symbol of the keyhole exists in mystic texts, sacred architecture and ancient artwork found all over the planet. Could this cryptic shape represent a profound connection to the cosmos? And is it a clue that was left behind by extraterrestrials who visited Earth thousands of years ago?

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According to the earliest Tibetan traditions, hidden high in the Himalaya Mountains is a kingdom of the gods–Shambhala. Is it possible that this mystical realm truly exists, and can be reached through ancient practices designed to access other dimensions?

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In numerous sacred traditions, the number twelve holds a divine significance. It can be found repeated in ancient architecture, groups of twelve wisdom keepers, and even the latest scientific principles. Could this divine number be part of an alien code left for humanity to decipher?

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Ancient Aliens is counting down the world’s top ten most mysterious sites, from the towering Moai statues of Easter Island to the enormous megalithic blocks of Stonehenge to the precision cut stones of Puma Punku. Could these extraordinary places provide evidence of extraterrestrial visitation?

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Mount Shasta in northern California is known as a hotbed of strange events; from Big Foot sightings, to UFO encounters, to hikers vanishing without a trace. Could the mountain’s unique geology and placement on Earth be attracting beings from other worlds… and even other dimensions?

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The South American nation of Peru is famous for its megalithic ruins, colossal geoglyphs and the Incan civilization. It’s one of the most mysterious places on Earth–but could it also be a site of extraterrestrial visitation? Ancient Astronaut theorists Giorgio A. Tsoukalos, author David Childress and investigative mythologist William Henry will examine a recently discovered “lost city” in Peru that has upended the historical timeline of South America, revealing that civilization emerged here thousands of years earlier than previously thought. Could it also provide evidence that Peru’s incredible ancient sites were built with the help of extraterrestrials?

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Scientists now know that seven human-like species lived alongside Homo sapiens for thousands of years. But why is it that only humans survived? Is it possible that we were the product of extraterrestrial experimentation? Ancient Astronaut theorists Giorgio A. Tsoukalos, David Childress and William Henry will be joined by Rabbi Ariel bar Tzadok and filmmaker Caroline Cory to investigate the mystery of the Human genome, in an attempt to determine if human beings are the product of an extraterrestrial experiment. Might the ultimate proof we are not alone in the universe be hidden in our own genetic code?

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Ancient Aliens is counting down the top ten mysteries of the deep, from sunken continents to puzzling ruins on the ocean floor and even artifacts that might be remnants of Atlantis. Could these underwater mysteries provide a record of extraterrestrial visitation?

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For thousands of years, people have held the belief that everyday objects can possess hidden energy. Talismans are seen as providing protection, good fortune, and some are even thought to embody a higher power. Could it be that what fuels our faith in talismans is not superstition, but a real connection to something beyond our world?

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