Secrets of the Alien Shrine

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.

Następny odcinek

S02E07 - Amazon Ghost Town