A village on a remote island was once home to the victims of deadly disease, but today, the island and its buildings are abandoned; experts investigate what went wrong in this strange place and what happened to the people who once lived here. The segments of this special come from various episodes.

Many of the world's most mysterious abandoned buildings are hidden underwater and underground. But now, experts use cutting-edge tech to reveal the secrets of these strange places and finally explain why they were deserted. The segments of this special come from various episodes.

The Nazis built secret megastructures during their bloodthirsty quest for world domination, but today, they're now abandoned; experts are rediscovering these lost places to reveal the mysteries of how they were built and why they were deserted. The segments of this special come from various episodes.

The Soviet Union built countless engineering marvels beyond the Iron Curtain, but today, these mysterious places are abandoned; experts use cutting-edge tech to reveal the secrets of how they were built and why they were abandoned. The segments of this special come from various episodes.

The United States is home to countless eerie and abandoned places; and using the latest tech, experts make new discoveries to reveal the secrets of how they were built and why they were abandoned. The segments of this special come from various episodes.

An abandoned system of caves was once the meeting place of a secret society that worshiped Satan and performed black magic. New discoveries at this mysterious site reveal what really happened here and why a Founding Father was a frequent guest.

A haunted prison with a terrifying past once housed America's most notorious criminals. But today, the fortress stands in ruin, and experts reveal evidence of ghostly secrets hidden in the crumbling jailhouse walls.

A vast network of subterranean bunkers in the American West was home to the power to destroy nations. But today, this facility is deserted, and new discoveries reveal why this eerie place was built and why it was abandoned.

On a desolate island near Greece, abandoned buildings are evidence of a group of people that were forbidden to leave; experts reveal who was forced to stay here and if there was a cover-up to conceal what really happened at this strange place.

A mysterious town in the hills of South Africa was once a booming community, but today, the eerie place is deserted; experts reveal the cataclysm that caused the people of this once-prosperous town to suddenly leave and never come back.

A mysterious castle was once a fairytale estate, but today, the building is said to be haunted, and experts investigate the secrets of this eerie fortress and the ghostly stories inside.

An abandoned town in the Nevada desert is the ruins of an American Atlantis, destroyed by catastrophic floods when the Hoover Dam was built; today, experts investigate the secrets of this eerie ghost town as water levels recede and the city reemerges.

At an infamous prison in the Amazon, the most dangerous criminals on earth faced hard labor, a hostile environment, and death by guillotine; today, it's deserted, and new discoveries reveal why this hellish compound was built and why it was abandoned.