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.

New discoveries reveal how a secret Russian military base in the Gobi Desert, a strange complex in an American wasteland and a relic high atop a mountain were built and why they are now 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.

Engineer and filmmaker Philip Grossman searches for the truth behind the nuclear meltdown of Chernobyl over 30 years ago. New evidence reveals the accident may be one of the greatest sabotages in history.