An unknown spirit lurks in the empty hallways of Ohio's Higginsport School. Is it evidence of a darker haunting caused by recent deaths on the property?
The research team head into the wilds of Minnesota to investigate howls heard at a Bigfoot hotspot. Can they catch a glimpse of the tallest Bigfoot ever seen?
Andrew heads to Minneapolis-Saint Paul to sample Midwestern comfort food. He explores the blend of old and new that gives the Twin Cities a flavour all its own.
Discover the truth behind the UFO cover up. Did a Nazi flying saucer crash in New Mexico? Are aliens living at Area 51? Or are these rumours to hide the real story?
Something in space is attacking the brains of our astronauts. What is it? Should NASA be worried about the sudden appearance of so-called space fireflies?
Don Wildman investigates the unexpected story behind the Alaskan flag, the madman behind an important English Language book and a quest to save Chicago.
Josh scours the Virginia backcountry in search of the legendary Thomas Beale treasure. With encrypted codes hiding its whereabouts, can he solve the mysterious puzzle?
Chris and Casey trek into the heart of Alaska to recover a lost plane that crashed whilst carrying two politicians onboard. Can they solve the 47-year-old mystery?
The team return to Fairbanks after escaping the storms at Gold Run. But with the season soon ending will they find enough gold to afford to return next year?
Investigating giant geoglyphs drawn into the earth by ancient Nazca tribes, Josh Gates flies to Peru to study newly-found lines and joins a psychedelic ritual.
Outlaw bikers are often secretive organisations. But are they international crime syndicates, or social clubs for outcasts and nonconformists? Discover the truth.
When astronaut Leroy Chao's high-risk spacewalk is interrupted by bright lights flying past, it sparks a major investigation. Could alien life forms be to blame?
As seasons change in McCarthy, the town is haunted by its darkest day. The icy ground thaws into a quagmire, and old-timer Tim Mischel is marooned at his remote cabin.
Josh Gates goes to the Cambodian jungle to explore the lost city of the Khmer Empire. He seeks a mystical relic believed to hold the power to incinerate enemies.
Whether its religious fire-and-brimstone, Armageddon, or visitors from outer space, the US has no shortage of people coming together to get swept up in the fervour.
The team heads deep into the Alaskan Interior outside of Fairbanks to investigate reports of a gigantic bear-like creature known as the Northern Giant.