What is left behind when urban areas are abandoned? Hear about some extraordinary ghost towns, including Pripyat - frozen in time after Chernobyl - and Hashima Island.
Enter the eerie world of abandoned Space Age projects. What became of the HARP gun in Barbados and the mountainside Barcroft Observatory in California? Find out today.
Learn more about some magnificent bridges that time forgot. A hurricane put paid to Goat Canyon Trestle in California, while Kinzua Viaduct was destroyed by a tornado.
Hear about some once-great triumphs of marine engineering, now left to rust. A ship graveyard in Maryland has been colonised by wildlife. And we go inside a Cold War sub.
Hear about some disused structures that were once at the forefront of power supply, including Kelenfold Power Station in Budapest and Wardenclyffe Tower in New York.
Hear how a crumbling hill in the Peak District and dunes in California caused the closure of two roads. Learn why a route used by the French Resistance shut in 2003.