This fascinating documentary series continues to explore evidence of aliens from millions of years ago to modern-day sightings.

Aliens and the Old West 44m As Native Americans and settlers crossed the plains of the American Southwest, scholars cite evidence of visitors from a much farther frontier.

Aliens and Monsters 44m Experts wonder if mythical creatures from folklore were transportation devices for extraterrestrial beings.

Aliens and Sacred Places 44m Holy sites around the world are examined to determine if they are entirely man-made or products of collaboration with interstellar tourists.

Aliens and Temples of Gold 44m Legends of hidden gold across the globe spark a discussion on whether or not this precious metal is a link to past alien lifeforms.

Aliens and Mysterious Rituals 44m Long-standing rites and rituals are seen as possible indicators of humankind's early efforts to emulate or communicate with aliens.

Aliens and Ancient Engineers 44m Theorists expound on the idea that the tools used to construct the world's most magnificent structures may have come from distant galaxies.

Aliens, Plagues and Epidemics 44m From baffling outbreaks to unidentified bacteria, Earth's most historic pandemics and other scientific mysteries could be traced to other worlds.

Aliens and Lost Worlds 44m The remnants of vanished civilizations are investigated to support the claim that celestial beings had a role in developing modern man.

Aliens and Deadly Weapons 44m The advancement of modern weaponry by mankind is viewed as the reinvention of alien technology.

Aliens and Evil Places 44m Researchers speculate that several locations around the world serve as warning signs for humanity by alien inhabitants from thousands of years ago.

Aliens and the Founding Fathers 44m Citing secret messages found in Washington, D.C., theorists wonder if America's first public leaders had concealed knowledge about extraterrestrials.

Aliens and Deadly Cults 44m Horrific acts of violence in history are analyzed to see if these events are based on otherworldly information.

Aliens and the Secret Code 44m Pundits study monuments constructed by early humans that could have been part of an interconnected global network.

Aliens and the Undead 44m From zombies to vampires, myths about life beyond death are probed for their potential otherworldly origins.

Aliens, Gods and Heroes 44m Scholars dive into the mythology of legendary characters to test the notion that these stories are based on the influence of aliens.