Mysteries of the Abandoned

Conspiracy on Devil's Mountain (2x5)

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A secret structure on a sinister mountain, an industrial compound swallowed by a forest, and a mysterious run in a sand dune are strange deserted engineering projects. Stories: 1) Tuefelsberg Listening Station, Berlin, Germany; 2) Phoenix Shot Tower, Baltimore, USA; 3) Politz Synthetic Oil Refinery, Police, Poland; 4) Rubjerg Knude Lighthouse, Jutland, Denmark.