Traces of a Russian hole to hell in the Arctic, a military base in America's wild west, and a strange looming tower are mysterious deserted engineering projects, and new discoveries reveal how they were built and why they were abandoned.
Stories:
1) Salton Sea Test Range, California, USA;
2) Kola Superdeep Borehole, Pechengsky, Russia;
3) Canfranc Railway Station, Aragon Valley, Spain;
4) Power Station IM, Charleroi, Belgium
