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Extraordinary feats of construction, created without the use of advanced tools or technology, can be found from the jungles of Costa Rica to England's rural countryside.

Ancient Aliens

The Monoliths

UnexplJoin top investigators as they seek to uncover the truth behind some of the world’s greatest mysteries and cover-ups

UnXplained Zone

A look into the Norse Viking; how they became teachers and destroyers; the gods they worshiped were fearsome and mysterious.

The Viking Gods

Erich von Daniken's theories that have ignited a movement known as Ancient Astronaut Theory.

The Von Daniken Legacy

In 1975, Travis Walton claims to have been abducted by extraterrestrial beings, but researchers say that alien abductions have been taking place for thousands of years, as depicted in biblical stories of abductions by otherworldly beings.

Strange Abductions

Hundreds of gigantic lines extend for miles throughout the Peruvian desert; scholars are divided as to who built them, and why; experts say Nazca may have been a mining operation for advanced beings.

Beyond Nazca

Historical prophets may have had alien influences; there are some who believe that extraterrestrials have used intermediaries; they were used to transmit important moral, philosophical and artistic codes to humanity.

Prophets and Prophecies

Archeologists uncover ancient tombs filled with strange items and writings; remarkable similarities found at these sites cause theorists to believe that some of these technically advanced tombs were designed with the help of extraterrestrials.

Secrets of the Tombs

Ancient alien theorists believe there is an extraterrestrial connection to the scientific genius of famous historical figures such as Albert Einstein, Galileo, Archimedes, and Aristotle.

The Einstein Factor

Researchers suggest that the Orion constellation may have been a star-gate or an entry point for extraterrestrials visiting Earth for thousands of years.

Destination Orion

Ancient alien theorists speculate about the depiction of light bulbs in Egyptian hieroglyphs and the batteries discovered among Mesopotamian artifacts and whether extraterrestrials introduced electricity to ancient peoples.

Alien Power Plants

In 1980, three young military men are sent into a UK forest to investigate strange lights, and they reportedly find a spacecraft, then they are ordered to never speak of the incident again; UFO encounters kept under wraps and what they reveal.

Aliens and Cover Ups

Researchers explore the strange similarities among pyramids in Egypt, Central and South America, China, Africa, and Indonesia, including a possible extraterrestrial link connecting these structures.

Secrets of the Pyramids

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

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History en espanol offers the best mix of History Channel's most popular shows and programs spotlighting Latino history.

S5 E3 | Alien Power Plants