Ancient Aliens

For thousands of years, pyramids were the largest structures on Earth. The best known were constructed in Egypt and Central America, but others have been found all around the world, including in China, Africa and Indonesia.

In 1980, three young military men were sent into a UK forest to investigate strange lights. They reportedly encountered a spacecraft of unknown origin. When one of the men touched it, he claims to have telepathically received a sequence of binary code.

Egyptian hieroglyphs depict the use of light bulbs in tombs and secret chambers. And batteries may have been discovered among artifacts from Mesopotamia. Did the Ancients understand electricity, and if so, how did they discover this technology?

Why were ancient civilizations around the world so focused on the Orion constellation? While scientists site many earthly connections, researchers suggest this point in the night sky may have been a so-called Stargate, or entry point, for aliens.

Was Albert Einstein a genius? Or was he superhuman? Was his genius of this world, or was it otherworldly? Is it possible, as Ancient Astronaut theorists believe, there is an extraterrestrial connection to the scientific genius of historical figures?

Across the globe, archaeologists have uncovered ancient tombs filled with strange items and writings. Remarkable similarities have been found at each of the sites. How is it possible that the burial chambers of distant cultures were so similar in design?

They were the messengers of divine knowledge and seers who shared visions of the future. For thousands of years, human civilization has been guided by the words and deeds of ancient prophets, but just who -- or what -- were they communicating with?

Reverence for the number three dates back thousands of years, and can still be found today in art, architecture, science, literature, and religion.

Erich von Daniken's landmark book, Chariots of the Gods, brought attention to the mysterious phenomena of the Nazca Lines.

Luminous relics in the shape of human skulls. Otherworldly artifacts believed to harness the secrets of the universe.

In 1975, Travis Walton claimed to have been abducted and taken aboard a space ship inhabited by extraterrestrial beings. Several people witnessed his encounter, and nearly 40 years later, Walton's story of alien abduction has not wavered.

A young man's spiritual journey. A controversial bestseller. And a scientific theory that threatened to change the world.

Advances in writing, agriculture, science, mathematics, medicine, astronomy, transportation, building, military, schools and city planning, all originated in Sumer.

They were teachers and destroyers. Mighty warriors who blazed across the skies in gleaming chariots and wielded magical weapons that could bring down mountains. Odin, Frey and Thor. The gods worshiped by the Norse Vikings were fearsome and mysterious.

Wondrous wizards... Mysterious sorcerers... And heavenly beings... possessed of unimaginable power.

Massive stone structures that reach to the heavens, strange giant figures buried deep in the Earth, and energy-emitting spheres connected around the globe. What compelled ancient man to move colossal stones?

He is the evil one, the Prince of Darkness, the ruler of Hell. Satan conjures up horrifying images of a horned beast.

Mysterious surgeries performed by early humans... Strange beings with miraculous powers.

Powerful monarchs ruling by divine right. Centuries-old dynasties amassing enormous wealth.

Sacred bones... Golden hats... And fragments of sacred objects thought to possess healing properties.