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"Ancient Aliens" is looking at alien petroglyphs around the world; from strange, human-like figures to flying craft and carvings of what appear to be astronauts.

Ancient Aliens

The Top Ten Alien Petroglyphs

Counting down 10 mysteries of the deep, from sunken continents to puzzling ruins on the ocean floor and even artifacts that might be remnants of Atlantis; these underwater mysteries could provide a record of extraterrestrial visitation.

The Top Ten Mysteries of the Deep

For thousands of years, people have held the belief that everyday objects can possess hidden energy; talismans are seen to provide protection, good fortune, and some are thought to embody a higher power.

The Power of the Talisman

In the 21st century, UFOs have gone from fringe science to mainstream obsession; a new generation of UFO hunters employ technology, and unidentified flying objects are openly investigated by the government.

The New UFO Hunters

Whether the gods of Greece including Zeus, Apollo and Poseidon from Mt. Olympus were extraterrestrial visitors to Earth.

The Gods of Greece

In the early 1900s, Edgar Cayce, a modern-day prophet from the hills of Kentucky, becomes a worldwide sensation; he claims to receive visions of the past and future, he heals the sick, and alleges to have encounters with otherworldly beings.

Edgar Cayce: The Sleeping Prophet

"Ancient Aliens" is counting down the top 10 alien craft, from V-shaped objects to orbs of light to flying saucers.

The Top Ten Alien Craft

"Ancient Aliens" is counting down the world's top 10 mysterious islands, including sites said to be home to giants, remote landmasses that are home to massive megalithic structures, and even islands that disappear into thin air.

The Top Ten Mysterious Islands

Counting down the world's top 10 mysterious devices, from strange, grooved disks found in a cave in China to an ancient Greek computer to an incredible crystal skull unearthed in Mexico.

The Top Ten Mysterious Devices

"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.

The Top Ten Pyramid Sites

Enormous, megalithic structures of mysterious origins; a vast underground complex containing the remains of what some believe to be otherworldly beings; the ancient mysteries that exist on the islands of Malta could be connected to alien visitation.

The Giants of Malta

Terrifying encounters at 40,000 feet; pilot accounts of UFOs taking control of their aircraft; entire jumbo jets disappearing into thin air; since the dawn of aviation, pilots have experienced unexplainable events in the sky.

Aliens in Our Airspace

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Texts, archaeology and legend contain evidence of past human-extraterrestrial contact.

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History HD reveals the power and passion of history as an inviting place where people experience history personally and connect their own lives to the great lives and events of the past.

S19 E9 | Aliens in Our Airspace