A strange deserted city in America's heartland, an eerie gigantic wall deep in snowcapped mountains, and a mysterious top-secret Soviet facility are deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.
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Retitled, this episode re-aired as "Nazis of the Alien World" on 3/15/2019 at 2100 with a summary of "New discoveries reveal why the world's most ambitious engineering projects were abandoned, unraveling the dark mysteries and bloody secrets of these strange ruins."