Strange lights are reported by security near the East Gate of RAF Woodbridge, a US Air Force base on England's east coast. But could extra-terrestrial visitors be to blame?
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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.
A strange creature similar to the Loch Ness Monster is spotted in the United States experts analyse evidence of a giant scaly egg, and some wonder if it belongs to a dragon birds are suddenly vapourised by an invisible death ray.
Deep sea explorers discover an unknown monster thousands of feet beneath the ocean killer fog threatens a town in the American Midwest a truck spontaneously explodes on a busy freeway.
When satellites capture a strange oozing grey mass in the Mississippi countryside, scientist Nick Pollock goes to investigate.
A perplexing, intricate symbol high up in the remote Peruvian Andes may be for the grisliest of child sacrifices - death by lightning strike.
A fire-breathing crater burns in the middle of a desert, and some suspect it is a gateway to hell. Also, a deadly shark is found lurking in a golf course water hazard. A giant white blob threatens a town in California.
An explorer searching for treasure at a Mayan sacrificial site is attacked by a mysterious underwater fog thousands of fish spontaneously jump to their deaths something alien appears over the skies of Los Angeles.
Over two nights, a silent, orange football-shaped object is spotted near the nuclear weapons storage site at Loring Air Force Base in Maine. Could alien visitors be to blame?
Strange lights are reported by security near the East Gate of RAF Woodbridge, a US Air Force base on England's east coast. But could extra-terrestrial visitors be to blame?
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.
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