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.
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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.
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.
In October 2017, astronomers at the Pan-STARRS observatory saw something strange in our solar system: an object they named ‘Oumuamua', the very first observed visitor from interstellar space. This programme contains some flashing images.
In Columbia, a massive animal vertebra is found. Dozens of jars packed with bones are discovered in Cambodia. On Peleliu Island a strange, rusted vehicle is discovered in the jungle. Trees that appear to be moving are investigated in Ecuador.
A huge structure high above the rainforest in Sri Lanka is investigated. Over 300 stone spheres are found in Costa Rica. In Mexico, the strange remains of a small man are discovered. A fossil unlike any known animal is uncovered in Madagascar.
A demonic truck driver, disembodied voices, nightmarish skinwalkers and a time loop are all reported to exist in Canyonlands National Park.
This tourist hotspot is also rumoured to be the epicentre of dark and sinister forces from Native American lore that lure visitors to their deaths.
A plane crash in the Everglades National Park leads to strange hauntings - and some believe the park may exert a dark, transformative power.
A strange series of events in Grand Canyon National Park leads researchers to speculate whether its power comes from forces that cannot be explained.
There are three types of close encounters with aliens, sightings, fleeting interactions, and the third kind where aliens take humans for extended periods. We look at instances of all three and meet real people who have experienced them.
For many people, the most credible UFO reports are those raised by law enforcement. We investigate the most significant reports from police records.
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