Mysteries of the Abandoned

New discoveries reveal how a strange Cuban prison, an eerie escape route built for Armageddon and an underwater marvel that changed history were built and why they are now abandoned.

New discoveries reveal how a mysterious American pyramid built out of Cold War paranoia, a haunted prison and a strange cluster of structures in the Atlantic were built and why they are now abandoned.

Traces of a Russian hole to hell in the Arctic, a military base in America's Wild West and a strange looming tower are deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

A secret Russian military base in the Gobi Desert, a strange complex in an American wasteland, and a relic high atop a mountain are mysterious deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.

New discoveries reveal how a secret structure on a sinister mountain, an industrial compound swallowed by a forest, and a mysterious ruin in a sand dune were built and why they are now abandoned.

New discoveries reveal how a strange alien shrine on a mountain peak, a bridge built in the Alaskan wilderness and an American castle with a dangerous secret were built and why they are now abandoned.

An American ghost town in the Amazon jungle, a secret Nazi base and a deadly 866-mile-long concrete fortress are mysterious deserted engineering projects. New discoveries reveal how they were built and why they were abandoned.

New discoveries reveal how a terrifying sea fortress, a highway in the Amazon that suddenly vanishes and a mysterious structure in the shadow of the Statue of Liberty were built and why they are now abandoned.