Mysteries of the Abandoned

Secrets of the Alien Shrine (2x6)

Air date: Apr 24, 2018

A strange alien shrine on a mountain peak, a bridge built in the Alaskan wilderness, and an American castle with a dangerous secret are mysterious deserted engineering projects, and new discoveries reveal how they were built. Stories: 1) Buzludzha Monument, Kazanlak, Bulgaria; 2) Miles Glacier Bridge, Alaska, USA; 3) Bannerman's Castle, New York, USA; 4) Georg Thiele, Narvik, Norway.