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Puma Punku in Bolivia features stone blocks, each carved with precision; the blocks lie scattered across the landscape, confusing archaeologists as to what the ancient site might have been.

Ancient Aliens

Resurrecting Puma Punku

From biblical patriarchs to modern day alien abductees, throughout history, there have been people who claimed to have contact with otherworldly beings; often bearing important messages for humanity.

The Chosen

For more than four decades, award-winning journalist Linda Moulton Howe has covered the most mysterious phenomena on Earth. Could her investigations on everything from bizarre animal deaths to crop formations and alien abductions lead us to a profound new reality?

The Linda Moulton Howe Files

Deep beneath the sands of Egypt lie 24 enormous sarcophagi, and every one of them is empty; discussing what purpose those giant tombs had served.

Tomb of the Cosmic Bulls

On Jacques Vallee's work in the field of UFOs and his theories on alien life.

Jacques Vallée: UFO Pioneer

Stories of god-like beings providing instruction to early humans, helping establish the first civilizations; exploring if mysterious figures who appear throughout history provide evidence that these otherworldly teachers have been here all along.

The Teachers

For thousands of years, humankind has attempted to make contact with beings from beyond Earth; now, the search for extraterrestrial intelligence is ramping up, with new technologies allowing individuals to explore the universe.

The Search For Extraterrestrial Intelligence

For decades, incredible claims have been made about an extraterrestrial presence on Earth, and the government has gone to great lengths to discredit them.

The Whistleblowers

For thousands of years, cultures around the world have held a belief in stargates through which beings have traveled to Earth from distant points in the universe and even other dimensions.

Unlocking the Stargates

Considered by many to be the greatest civilization in the history of the Americas, the Maya thrived for more than 2,000 years; today new evidence is being discovered that completely upends our understanding of this ancient culture, and might provide evidence that the Maya came in contact with extraterrestrial visitors.

Mysteries of the Maya

Throughout the world there are mysterious ancient stones shaped into perfect spheres; many of them show clear evidence of being manmade and some completely defy explanation; the mystery of the stone spheres could provide clues about humankind's past.

Mystery of the Stone Spheres

For thousands of years, Scotland has been an epicenter of otherworldly phenomena; it is home to mysterious ancient stone circles, stories of strange beings, and is a major hotspot for UFO sightings.

Mysteries of Scotland

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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.

S20 E14 | The Search For Extraterrestrial Intelligence