Previously sealed documents hint at compelling new theories about extraterrestrials. Could aliens be living among us? And could former US Presidents know something we don't?
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Man-made islands are spotted near a Korean missile facility and when something unexpected is found in a desert, experts investigate a lost city of giants.
A look at dolphin rescues, death-smelling pets and a skinny teen with unbelievable strength.
Did San Francisco's sea lions sense an impending disaster, what are the secrets of a mysterious medieval manuscript, and why do mummies in Egypt contain cocaine from Peru?
For decades, there have been rumours key members of Hitler's inner circle escaped the fall of Berlin - maybe even the Fuhrer himself. But where did they go and what is their plan?
Evidence suggests that time travel may have occurred in the past.
In the Solomon Islands, a strange cave is explored. Two skulls from an unknown animal are found in Vietnam. In South Africa, ancient human remains are found in an unexpected place. An old truck is discovered in the dense Guyanese jungle.
In Mexico, dozens of skulls and bones are found on a cave floor. Strange grass covered domes are investigated in the Philippines. Carved stone figures are discovered in Hawaii. In Peru, a tiny silk structure stumps researchers.
Previously sealed documents hint at compelling new theories about extraterrestrials. Could aliens be living among us? And could former US Presidents know something we don't?
Experts investigate why so many UFO sightings take place in Los Angeles, determining that the answer may lie underwater.
There have been doomsday signs and prophecies for centuries, and humans' time on this planet may be nearly over.
It's early evening in rural Pennsylvania when several dozen witnesses report seeing a fiery object falling through the sky and landing in the nearby woods.
Two cousins, Billy and John Smith, are driving in separate cars when they encounter a massive 'mothership' three times the size of a football stadium.
In Part One, the story begins with Parker and Hickson's horrifying claim: abducted by three alien beings, subjected to a nightmarish examination, and left forever changed.
Grieving siblings trespass into the territory of a legendary beast during a midnight drive. A weekend getaway ends in a terrifying encounter.
Often, even skilled professionals are no match for the spirits they encounter, as those hunting in the great outdoors become the ones stalked as prey.
Part Two expands the mystery, exploring the aftermath of the encounter. Parker and Hickson were tested for radiation at Keesler Air Force Base, their accounts scrutinised yet inexplicably consistent.
As Captain Terauchi and his Japanese airline crew travel across Alaska, they encounter blindingly bright lights flying in their airspace. Could extra-terrestrials be to blame?
On a country road, Betty Cash, Vickie Landrum and her grandson Colby encounter a large, unexplained diamond-shaped craft shooting fire out of its base.
Evidence might finally identify the hiding place of the billion-dollar Nazi gold train and blood-red river in Siberia points to catastrophic pollution.
Residents of a Texas town report strange lights in the night sky. Scientists record one of the loudest sounds in the natural world.
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