Revisiting deserted engineering projects to find out how they were built and why they were mysteriously abandoned. Stories: 1) Goat Canyon Trestle Bridge, California, USA; 2) Duga Woodpecker, Duga, Ukraine; 3) Prora, Germany; 4) Grand Goulets Road, France.

Exploring a top-secret relic that could have changed the Cold War, a ghost town that was once a dangerous industrial hellscape, a wooden road, and a giant warship at the bottom of the ocean. Stories: 1) H.A.R.P. Super Gun, Yuma, Arizona; 2) Hashima Island Coal Mine, Japan; 3) Plank Road, California, USA; 4) Half Moon Bay, Victoria, Australia.

Exploring the Kinzua Bridge in Pennsylvania; what happened to the large town located just outside of Chernobyl on the eve of disaster in Pripyat, Ukraine; a dangerous mountain road in Italy that changed history; a fleet of ghost ships in Maryland. Stories: 1) Kinzua Viaduct, Pennsylvania, USA; 2) Pripyat, Chernobyl Nuclear Power Plant, Ukraine; 3) 52 Tunnel Road, Monte Pasubio, Italy; 4) Mallows Bay, Maryland, USA.

Stories of incredible engineering projects that are now deserted. Stories: 1) Launch Complex 33, White Sands, New Mexico, USA; 2) Zeljava Air Base, Croatia; 3) Kelenföld Power Plant, Budapest, Hungary; 4) Scapa Flow, Orkney Islands, Scotland, UK.

Abandoned engineering projects include a strange tower that left an enduring legacy in Russia; a top-secret Nazi facility in Peenemunde, Germany; the Marx generator in Istra, Russia; the Mam Tor road in The United Kingdom; an abandoned road in Cape Town, South Africa. Stories: 1) Shukhov Tower, Nizhny Novgorod, Russia; 2) Peenemunde, Usedom, Germany; 3) Marx Generator, Istra, Russia; 4) Mam Tor, Derbyshire UK; 5) Foreshore Freeway Bridge, Cape Town, South Africa.

An ambitious Nazi project in the Czech Republic; a Cold War relic in Rochester, England; a cutting-edge research complex built by Nikola Tesla; and a research station in the California mountains. Stories: 1) Borovsko Bridge, Švihov, Czechoslovakia; 2) B39 Black Widow, Rochester, England; 3) Wardenclyffe Tower, Long Island, USA; 4) Barcroft Field Station, California, USA.