Ancient Aliens

In numerous sacred traditions, the number 12 holds a divine significance. It is repeated in ancient architecture, groups of 12 wisdom keepers and the latest scientific principles. Could this number be part of an alien code left for humanity to decipher?

According to early Tibetan traditions, hidden high in the Himalaya Mountains is a kingdom of the gods -- Shambhala. Is it possible that this mystical realm truly exists and can be reached through ancient practices designed to access other dimensions?

The mysterious symbol of the keyhole exists in mystic texts, sacred architecture and ancient artwork found all over the planet. Could this cryptic shape represent a connection to the cosmos? And is it a clue that was left behind by ancient Earth visitors?

Ancient cultures throughout the Mediterranean recorded stories of enormous beings that descended from the sky. Could massive megalithic structures and reported discoveries of towering human-like skeletons reveal that the region once held giants?

Rebellious angels, giant hybrid beings and humans taken up to a heavenly realm above the Earth are all found in the Book of Enoch. Is it possible that it was stricken from the Bible because it documents humanity's extraterrestrial origins?

William Shatner brings thought-provoking questions to leading experts, including Ancient Astronaut theorists Giorgio Tsoukalos, Erich von Daniken, David Childress, William Henry and Linda Moulton Howe.

Throughout the world, ancient objects have been found that leave archaeologists at a loss. Could these impossible artifacts suggest that advanced -- and perhaps even extraterrestrial -- civilizations existed on Earth thousands of years before our own?

Blasting off into the stars is humankind's most profound achievement. But is it possible that our voyages into the cosmos are really a return to our true origins? And if so, as we venture out, will we encounter space travelers from other worlds?

In the 20th century, pioneering scientists, journalists and investigators defied convention and began documenting UFOs. Now, with incredible new UFO accounts coming to light, will their work finally culminate in undeniable proof of alien visits?

Archaeologists have discovered ancient sites that were built with an acoustic purpose, and often resonate at a frequency that has an effect on the human brain. Could ancient people have been aware of a harmonic code that put them in contact with aliens?