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.
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A hidden ancient city is found in Micronesia. In New Guinea, an airplane wreck is investigated. A strange glowing forest is discovered in India. An immense tunnel system in the Brazilian jungle is explored.
In the Philippines, researchers find ancient Rhino bones. Near the Columbia-Panama border, an old car is discovered in the jungle. A Brazilian island is infested with thousands of deadly snakes. In Kenya, human remains are found deep in a cave.
Discover the forces living in the secret underworld of Death Valley National Park, where a series of deaths and disappearances have taken place.
A series of incidents in Big Bend National Park leave experts convinced of secret alien activities taking place there.
A trip through the ginormous forest in Arizona. Strange encounters rumoured to have happened there include an alien abduction.
Explore Cleveland National Forest, where reports of gun-wielding ghosts, savage creatures and otherworldly portals are rife.
Was a UFO shot down by the RAF above South Wales on the 26th of February 2016? Craig and Sarah Cruddas examine the evidence as they try to discover if it really was an extra-terrestrial event. This programme contains some flashing images.
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.
A mysterious craft rises out of the Costa Rican jungle and is captured on camera. Some say it's the best footage of a UFO they've ever seen. But could it also reveal some of the technical secrets behind otherworldy engineering?
A hidden ancient city is found in Micronesia. In New Guinea, an airplane wreck is investigated. A strange glowing forest is discovered in India. An immense tunnel system in the Brazilian jungle is explored.
Few know that one of the US's most mysterious National Parks is in Puerto Rico - a place some believe is home to a creature known as the Chupacabra.
Many believe Gettysburg National Military Park is haunted by its violent past - here, explore some incredible claims about the park's history.
Few know that one of the US's most mysterious National Parks is in Puerto Rico - a place some believe is home to a creature known as the Chupacabra.
From inexplicable disappearances to mysterious experiments, events in Mount Shasta National Park may be explained by an ancient Karuk Indian legend.
In Montana's Glacier National Park, some claim that there is a hidden underground Nazi base that may even have been the final hideout for Hitler himself.
Human remains are discovered high in the Ecuadorian Andes. In Norway, an archaeology student unearths metal artefacts. A strange earthquake-like event is investigated in Canada. In Greenland, a Viking longhouse with a unique history is found.
Archeologists in Russia unearth an astonishing number of mass graves. A World War II era American military plane is found on a Canadian mountain. Strange cosmic rays coming from Antarctica's ice has physicists stumped.
A trip through the ginormous forest in Arizona. Strange encounters rumoured to have happened there include an alien abduction.
Explore Cleveland National Forest, where reports of gun-wielding ghosts, savage creatures and otherworldly portals are rife.
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