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The White House has consistently denied having any knowledge of alien craft visiting Earth, but presidential encounters with UFOs and other strange phenomena can be found going all the way back to George Washington.

Ancient Aliens

Aliens and the Presidents

UFO witnesses have reported a wide variety of objects in Earth's skies and not only in modern times, but for centuries; could they offer important clues about other intelligent life.

The Ultimate Guide to UFOs

Nestled within a remote valley in Utah is a ranch that some believe is a hotbed of strange, inexplicable phenomena including terrifying creatures, paranormal apparitions and lights in the sky.

The Mystery of Skinwalker Ranch

Accounts of creatures that can shape shift from one form into another can be found, but could similarities between the ancient stories and modern-day alien abduction accounts reveal that shape shifters are real and have come to Earth.

The Shapeshifters

In the Mojave Desert, there is a structure built to bestow everlasting life and according to the architect, the blueprint was provided by an extraterrestrial visitor known as the Integratron, could it actually provide the key to immortality.

The Immortality Machine

In numerous ancient cultures throughout the world, stories were told of ancestors that came to Earth from the Pleiades star cluster, but could new scientific findings reveal that humankind's true origins lie not on Earth but 400 light years away.

They Came from The Pleiades

Shocking new evidence reveals that advanced civilizations might have existed on Earth tens of thousands of years ago; is it possible that a technologically advanced society thrived on Earth, and did they leave behind a record.

The World Before Time

From Egypt to Easter Island, towering figures built by ancient man stand watch over the Earth; discussing if these stone giants str simply a testament to humanity's past or if they could depict visitors from another world.

The Mystery of the Stone Giants

The Chilean government questions whether new footage from a Navy helicopter indicates a connection to geoglyphs in the Atacama Desert.

Destination Chile

In 1947, the U.S. military collects debris from what they claim is a crashed weather balloon outside of Roswell, N.M.; new evidence may prove that the wreckage belonged to an alien spacecraft and that remnants may have been overlooked.

The Relics of Roswell

UnexplJoin top investigators as they seek to uncover the truth behind some of the world’s greatest mysteries and cover-ups

UnXplained Zone

Giorgio Tsoukalos and David Childress explore the mysterious chain of manmade islets in Micronesia's Nan Madol; built from 250 million tons of volcanic rock, there are local legends that strange visitors floated the massive rocks through the air.

The Mystery of Nan Madol

Texts, archaeology and legend contain evidence of past human-extraterrestrial contact.

S15 E12 | Aliens and the Presidents

E12 | Aliens and the Presidents

E11 | The Ultimate Guide to UFOs

E10 | The Mystery of Skinwalker Ranch

E9 | The Shapeshifters

E8 | The Immortality Machine

E7 | They Came from The Pleiades

E6 | The World Before Time

E5 | The Mystery of the Stone Giants

E3 | Destination Chile

E2 | The Relics of Roswell

E1 | The Mystery of Nan Madol