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Giorgio Tsoukalos takes a look back at the incredible hieroglyphs, petroglyphs, and geoglyphs that he believes tell a worldwide story--of alien visitation.

A 2,000-year-old computer... a power plant inside the Great Pyramid... and a Nazi-era time machine with roots in the ancient history.

Are governments around the world preparing mankind for the most startling event in human history--the official disclosure of an extraterrestrial presence on Earth? And if so, why is this happening now and what might happen in its aftermath?

Accounts of creatures that can shapeshift from one form into another can be found throughout history.

Across the globe, high-ranking government officials are openly talking about Unidentified Aerial Phenomena. Ancient Astronaut theorists suggest the evidence has become too great to ignore.

Ancient Astronaut theorists believe aliens have been visiting earth for thousands of years. If so, might we find evidence of this even in the stories of America's Old West?

Myths and legends have long been regarded as fantastic stories that describe powerful gods, mutant giants and fearsome monsters. But why do so many different cultures, separated by vast distances, tell the same stories?

In the nearly 2,000-year-old text called "The Zohar", there is a curious passage that describes hidden realms beneath the surface of the Earth--each of which is said to be populated by both human and non-human intelligences.

In ancient times, people spoke about divine substances that were consumed by the gods, and sometimes gifted to humans to impart great power, wisdom, and even immortality. But could it be that the food of the gods was really sustenance for alien visitors?

The South American nation of Peru is famous for its megalithic ruins, colossal geoglyphs and the Incan civilization. It's one of the most mysterious places on Earth--but could it also be a site of extraterrestrial visitation?