A Russian hole to hell in the Arctic, a military base in America's wild west, and a strange looming tower are mysterious deserted engineering projects. Then the mystery of an abandoned alien Nazi structure and a Soviet monolith are revealed.
A mysterious pyramid built out of Cold War paranoia, a haunted prison, and a cluster of structures in the Atlantic are mysterious deserted engineering projects. Then, the mystery of a secret structure on a mountain and an industrial compound are revealed.
A deserted city in America's heartland, an eerie gigantic wall deep in snowcapped mountains, a deserted town in Spain and a mysterious top-secret Soviet facility are deserted engineering projects, but new discoveries reveal how they were abandoned.
Alien shrine, a bridge in the wilderness, a castle with a secret. A sea fortress, a highway in the Amazon and a mysterious structure by the Statue of Liberty are engineering projects, and new discoveries reveal how they were built and why they were abandoned.
New discoveries reveal an American ghost town in the Amazon jungle and eerie ghost ships stranded in an alien deserts.