Antarctica may serve as home base for extraterrestrial visitors to Earth, but as human exploration of the frozen continent increases, humans may come face to face with the ruins of an ancient advanced civilization buried beneath the ice.

Satellite images have revealed a giant face that appears to be carved into the Earth in Alberta, Canada, which has now become known far and wide as "The Badlands Guardian."

Aliens from the tiny star Sirius B may have visited humans in the distant past, imparting the knowledge of civilization to peoples thousands of miles apart.

Lurking in the oceans are creatures that defy explanation, such as octopuses that can edit their own DNA or animals that can regenerate their entire brain; examining if the oceans are acting as a giant petri dish for alien genetic experimentation.

When Spanish Conquistadors obliterated the historical record of the Maya in the 16th century, did they wipe out evidence that ancient people traveled to the Americas from all over the world – and in flying craft provided by extraterrestrial visitors?

Did ancient Druids travel to New England and New York's Hudson Valley centuries ago, bringing with them the beliefs and technologies of their alien mentors, the Shining Ones of Irish myth? And did they leave behind vital clues in the form of mysterious stone structures still visible on the landscape?

Serpent gods are found in the traditions of Mesopotamia, Central and South America, India, China, Japan and the Bible; a look at if these stories describe a race of reptile-like extraterrestrials instead.

In 2016, scientists made the astonishing discovery that 30 percent of all protein adaptations since humans' divergence with chimpanzees have been driven by viruses. Could ancient aliens have shaped human evolution by introducing viral epidemics on Earth? And if so, for what purpose? Are they making us more like them?

Extraterrestrials could be altering human DNA and repopulating the Earth with alien/human hybrids; following the trail of evidence from ancient cultures to modern-day animal mutilations and alien abductions.

Could paranormal activity be explained by beings entering our world from other dimensions? According to some Ancient Astronaut theorists, entities that have been described as ghosts, angels, and extraterrestrials are actually visitors from unseen realms — and they are among us even now.

The native Hawaiians trace their ancestry to beings from the Pleiades star system called the Akua. Could these islands have once been inhabited by extraterrestrials? And is it possible that the enormous energy generated by Hawaii's volcanic activity could produce a portal through space and time?

Throughout the ancient world, structures were built to mirror the constellations in the night sky and this is only apparent when they are viewed from high above; a look at the possibility that these structures were designed as messages.

Ever since the first atomic bomb was detonated in 1945, UFOs have been reported at nuclear facilities all over the world. Is it possible that extraterrestrials are monitoring humanity's nuclear capabilities? But why? Does this constitute a threat? Or are they trying to ensure humankind's survival?

A mysterious mountain in northern Italy has stood witness to strange sightings in the sky and unexplainable phenomena for hundreds of years but could it be attracting extraterrestrial visitors and there could be technology within its rocky slopes.

A look at the possibility that the human brain possesses extraordinary untapped abilities granted by extraterrestrial beings -- such as telepathy, precognition and psychokinesis; abilities that will enable the next step in the evolution of humans.

A shocking study reveals that the original builders of Stonehenge mysteriously vanished; but Stonehenge's mysterious Bluestone circle could have activated a portal that transported the ancient culture back to their former home among the stars.

Divine substances were consumed by the gods but sometimes gifted to humans to impart great power or wisdom; could the food of the gods be sustenance for alien visitors and does it lend insight into humanity's future.

Tattoos, piercings, and body modification account for a nearly one-billion-dollar industry, but are these practices a bold form of self-expression or could they be motivated by a profound link to ancient ancestors.

In 2019, millions responded to an internet post advocating to storm the gates of the world's most top-secret military installation -- Area 51 but when they did, the U.S. military vowed to defend the base with deadly force.

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?

Did intelligent beings from outer space visit Earth thousands of years ago? From the age of the dinosaurs to ancient Egypt, from early cave drawings to continued mass sightings in the US, each episode gives historic depth to the questions, speculations, provocative controversies, first-hand accounts and grounded theories surrounding this age old debate.