Strange mounds in Transylvania might pinpoint the location of the tomb of the bloodthirsty tyrant believed to have inspired Dracula. A mysterious ancient city is discovered on a coral reef. Images of a plane crash sets off a hunt for a drug lord.
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A look at the future of mind control, a extinct hobbit race and whether humans can regenerate our limbs.
Check out a heart patient's unbelievable transformation, circles of ice in rivers and a shocking DNA test.
Ron Johnson, 16, is feeding the family sheep when he suddenly sees a mushroom-shaped object appearing in the field emitting a blinding light. Could it be a UFO?
It's 11am at the Westall School in Melbourne, Australia when a classroom of students playing outside see a saucer-shaped object in an adjacent field. But could it be aliens?
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.
In 1952, radar picked up a series of UFOs flying over Washington DC. The story hits the newspapers, overshadowing the presidential campaign, so President Truman fights the UFOs with his most powerful weapons: disinformation and bureaucracy.
Is the satellite in Earth's orbit that astronauts discovered in 1998 the same one that Nikola Tesla detected back in 1899?
From military radar to Navy aircraft, sightings of Unidentified Aerial Phenomena have become more frequent - leading to unprecedented acceptance of alien contact.
With science closer than ever to proving that life once lived on Mars, is there a chance that something still exists there?
While many UFO sightings occur in rural locations with only a single eyewitness, there have been sightings over cities witnessed by hundreds.
Between 1981 and 2011, cameras on NASA space shuttles have picked up many images of UFOs that experts still struggle to explain.
Explore the mystery of a sunken fleet in Maryland, weird Arctic holes that NASA cannot explain and strange structures in the desert close to Area 51.
Three incredible stories of people who cheated death: on 9/11, almost 3,000 people die in the collapse of the World Trade Center but one man caught in the avalanche of debris walks away with barely a scratch.
Three ancient artifacts that could turn the history of the world upside down: In a Mexican cave, a young girl finds a bizarrely-shaped thousand-year-old skull that may prove aliens once walked the planet.
The US government officially recognise UFOs, calling them Unidentified Aerial Phenomena. In this episode Craig and Sarah take on the US Navy UAP videos. They speak to an ex-MOD official, Nick Pope. This programme contains some flashing images.
In 1860, workmen digging a drainage ditch in a Scottish hamlet discover the Towie Ball, a strange and beautiful black stone object about three inches in diameter. It has been painstakingly carved into a bulbous shape from a single block of rock.
In a display case at Harvard University's Warren Anatomical Museum is one of the most astonishing objects in medical science – the shattered skull of a 19th century American railway worker.
Recently declassified FBI files cast new light on the existence of aliens, as well as question whether the Vatican could be hiding proof of extra-terrestrial life.
Farmer Edwin Fuhr is harvesting crops when he spots a stainless steel metal object hovering in his field. Suddenly, four identical objects appear, but could aliens be to blame?
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