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.
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Many believe that extraterrestrial secrets are not just limited to the military - so could deathbed confessions provide evidence of the existence of UFOs?
From the lore and history of ancient Egypt to the myths of Native Americans, mankind's past is riddled with the evidence of UFOs.
A sinister locomotive breathes fire into the night sky, and locals fear it's a demonic train coming to claim their souls when something terrifying emerges from a mysterious lake in Ireland, experts wonder if it could be a modern-day leviathan.
Near Area 51, a police convoy is filmed transporting an alien-looking craft in the dead of night when strange beams of light are reported in Argentina, experts investigate if it's proof of a terrifying Nazi superweapon
When satellites capture a massive crater in the picturesque English countryside, historian Martin Morgan heads there to investigate.
A shipwreck in Lake Michigan has an incredible history. How did this vessel, once part of Hitler's push to win World War II, end up stranded in one of the Great Lakes?
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.
A strange structure discovered in the Gobi Desert could reveal the whereabouts of lost treasure - changing everything we know about Genghis Khan.
Merging advanced scanning technology and scientific research, the series investigates the curiosities that have been lost for millennia, or never seen before, exploring how and why they ended up in the most desolate and distant corners of the planet.
Merging advanced scanning technology and scientific research, this series investigates curiosities that have been lost for millennia, or never seen before, exploring how and why they ended up in the most desolate and distant corners of the planet.
From Fort Knox to Hangar 18 and Camp Hero, discover a series of top-secret and high-security national database centres.
Secret satellites. Death stars. The weaponisation of outer space. Are governments the world over preparing for an alien attack? And if so, why are we being kept in the dark?
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.
Evidence suggests the world's governments could be on the verge of announcing everything they know about UFOs. What will this mean for our society?
Journey to the world's hottest UFO zones, where physical and paranormal phenomenons and unidentified objects and aliens are reported with alarming frequency.
Trouble on the border – a UFO is captured on camera. Is it being used for smuggling by wealthy drug gangs, or is there a less earthly explanation? A woman is filmed as she disappears from her bed – is she being abducted by aliens as she claims?
Residents of a Texas town report strange lights in the night sky. Scientists record one of the loudest sounds in the natural world.
A high-rise window washer somehow survives a 50-storey fall and basketball-sized ice chunks fall from the sky.
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