Two Chicago socialites at a top hotel are accused of a gruesome crime, an eccentric chef ruins a customer's career and a stage coach driver keeps a shocking secret.

Which hotels are the backdrop for a scandal-prone president's death, the neighbourhood game that inspired the lottery, and the man who saved Yosemite?

Medium Amy Allen and retired homicide detective Steve DiSchiavi combine their unique skills to solve unexplained paranormal events.

Amy, Adam and Chip answer a couple's desperate call for help. The wife fears a dark entity is possessing her husband, causing blackouts and fits of anger.

Bisbee, AZ. The team head to Bisbee, Arizona to investigate the one-time mining town's rough past. And, they head underground for the first time in their paranormal careers.

Josh Gates journeys into the heart of Mongolia in search of the fabled lost tomb of Genghis Khan. He examines historical evidence, facts and myths.

In 1976, Hans helped a family who were terrified by the spirit of a grieving widow. The team visit Port Clyde to investigate a resurgence in paranormal activity.

In 1968, Hans feared possession at the hands of a powerful entity. The team travel to Waterford, Maine, to confront this dark presence.

Hans Holzer conducted several investigations of Franklin Castle in Ohio. The team uncover why Hans refused to publish his findings on this mysterious case.

In 1969, Hans Holzer's investigation of Howard Lodge was abruptly cut short. The team travel to Maryland to uncover the truth behind this spooky manor.

Hans Holzer visited Mystery Hill countless times throughout his career. The team are in New Hampshire to uncover the dark truths buried on this hilltop.

Amy and Adam visit an old Masonic temple shrouded in mystery and local lore. They soon realise they may be investigating a cold case murder.

Amy and Adam visit a home suddenly plagued by paranormal activity. The discovery of an old shoe might have triggered this disturbing haunting.

Deep in the Alaskan wilderness is America's toughest town: McCarthy. Locked in winter's grip, the 42 brave souls who live here battle to keep their pioneer lifestyle.

The last days of winter bring change. The future of town lies in the balance. Jason races the melting river crossings to reach his crashed airplane.

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.

The Sun's Evil Twin. Witnesses photograph two suns in the sky over Indonesia - is this the first sighting of the Sun's dark twin that could spell imminent danger to Earth?

Secret Aliens. Geologists discover alien deposits on the Earth's surface - and the answer could shed light on the cause of the greatest extinction in its history.

A NASA probe captures an image of a familiar structure on the surface of Mars. What made 'Mars Henge'? Plus, how did an Apollo astronaut get sick in on the Moon?

CIA's Secret Revenge. When the Soviet Union unveils its own space shuttle, the CIA hatches a revenge plot. Plus, a missing nuclear weapon could threaten a NASA base in the Arctic.

A NASA spacecraft suffers a malfunction in orbit - can its lone astronaut make it back to Earth? Plus, new evidence emerges over Yuri Gagarin's mysterious death.

The team visit a mansion in Virginia for its first-ever paranormal investigation. They seek out the spirit of a young woman said to roam the grounds.

In California, the team investigate a dark and unsettling presence aboard the notorious Queen Mary. The spirit that confronted Hans in 1976 has supposedly risen again.

Vicksburg, MS. The team head to Mississippi, site of the Siege of Vicksburg, to investigate a haunting that dates back to the Reconstruction Era. Can they settle the restless spirit?

Buried Secrets. When mum Lita and daughter Bonnie of the Cristallo family begin seeing a frightening, ghost-like figure around the house, they know that they are not alone.