For thousands of years, pyramids were the largest structures on Earth.

In 1980, three young military men were sent into a UK forest to investigate strange lights. They reportedly encountered a spacecraft of unknown origin.

Did our ancestors have an understanding of how to generate power thousands of years before modern man?

Why were ancient civilizations around the world so focused on the Orion constellation? While scientists site many earthly connections.

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?

Across the globe, archaeologists have uncovered ancient tombs filled with strange items and writings. Some believe that these tombs were designed with the help of extraterrestrials.

For thousands of years, human civilization has been guided by the words and deeds of ancient prophets. But just who-or what-were these prophets 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.

Alien abductions are not a new phenomenon. The Bible is filled with stories of abductions by aliens. Is it possible that extraterrestrials have been abducting humans for thousands of years?

A young man's spiritual journey. A controversial bestseller. And a scientific theory that threatened to change the world. Just what are the facts behind Erich von D niken and Ancient Astronaut theory?

The gods worshipped by the Norse Vikings-Odin, Frey and Thor among them-were fearsome and mysterious, but were these beings truly divine, or is there, perhaps, an extraterrestrial connection?

What compelled ancient man to move colossal stones and to build remarkably similar stone monuments all around the world? Could extraterrestrials have instructed them to build these monoliths?