The team's epic overseas investigation takes them to Ireland's most haunted prison. Something strikes Dakota with a fear he's never experienced before.

Drawn to small town Iowa by reports of aggressive shadow figures, Nick and Katrina venture to the harrowing halls of Malvern Manor for 72 hours to capture evidence.

The team seeks out the elusive shadow figures lurking in the Waverly Hills Sanatorium in Kentucky. They use high-tech kit to catch shocking new paranormal evidence.

Paranormal investigators reveal a bold new theory about the origins of the Wendigo. Are the stories of this terrifying creature with cannibalistic cravings true?

The team is trapped in an ancient, underground tunnel putting the search at risk. They rig a remote-controlled camera to find the expedition's most significant treasure.

A famous UFO case occurs above Alaska when an unidentified flying object pursues a Boeing 747. Locals suspect a monstrous bird stalks the skies.

A secret government facility in the wilderness may be hiding an extra-terrestrial pyramid. And, are strange forces in the Triangle making wildlife more aggressive?

Josh Gates dives into a mystery below South America's Lake Titicaca. Josh discovers ruins from the ancient Tiwanaku people hidden in the lake's depths.

Josh Gates heads to the Scottish Highlands. His search focuses on a huge gold reserve hidden after the Jacobite uprising of 1745 and never recovered.

Deep in the Peruvian jungle, dozens of mummies have been found in cliffside tombs. Archaeologist Ramy Romany searches for evidence of who these people were.

The mummies of three Incan children are discovered in the Andes at a notorious UFO hotspot. Ramy examines why they trekked 1,000 miles to their death.

The team find a clue that leads them to consult with a local who is knowledgeable of the area. With his help, they find the entrance to a secret underground tunnel system.

The team is trapped in an ancient, underground tunnel putting the search at risk. They rig a remote-controlled camera to find the expedition's most significant treasure.

After being devastated by a powerful windstorm, it's all hands on deck as the town recovers. Mark must clear dangerously damaged trees before it's too late.

A bulldozer breakdown sends Jeremy on a high flying cross-country journey. When a wolf stalks Jenny, it's woman versus wild as she faces off with the fierce predator.

Images of Mercury reveal massive spider-like formations on its surface. Is it an odd geological formation - or something much more ominous?

How did pictures from the Hubble telescope make the comet of the century look like an alien spacecraft? Has earth already been invaded by alien organisms?

The team answer a Pennsylvania couple's call for help. They believe a cursed "witching tree" in the yard is behind the spirits haunting their 19th-century house.

The Spirit Hunters travel to Jones, Alabama, to help a woman who believes a ghost is choking her every night in her sleep. Is a family curse to blame?

Best-selling author Whitley Strieber recounts his 1985 alien abduction. He returns to the remote cabin to find out if he can still make contact with the otherworldly beings.

Experts investigate evidence suggesting that one of the world's most elusive figures, the Yeti, lives in America and may have an otherworldly source.

Steve heads to Holly Springs, Mississippi, where a family is tormented by the ghost of a psychiatric patient. He unearths a dark secret haunting the town.