Stories of incredible engineering projects now deserted, including a massive military site that was once a hotbed for nuclear testing, a top-secret airbase hidden inside a mountain, and an otherworldly power plant.
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Retitled, this episode re-aired as "Lair of Annihilation" on 3/8/2019 at 2200 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."