Mysteries of the Abandoned

Secrets of Alien Stonehenge (3x10)

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An alien Stonehenge with a sinister purpose, an eerie building filled with strange labyrinths, and an endless concrete track in the middle of nowhere are deserted engineering projects. Stories: 1) The Henge, Ludwikowice Kłodzkie, Poland; 2) Old Millfun, Shanghai, China; 3) Aerotrain Test Track, Chevilly, France; 4) Secret Nuclear Bunker, Kelvedon Hatch, England