A terrifying sea fortress, a highway in the Amazon that suddenly vanishes, and a mysterious structure in the shadow of the Statue of Liberty are deserted engineering projects; discoveries reveal how they were built and why they were abandoned. Stor... (more)ies: 1) Petrobras Viaduct, São Sebastião, Brazil; 2) Patarei Prison, Tallinn, Estonia; 3) Ellis Island, New York Bay, USA; 4) Ouvrage Restefond, Col de la Bonnette, France

Andrew Gough, Daniel 'Dan' Dickrell, James S. Corum, Jim Meigs, John McInnes, Lynette Nusbacher, Martin Andreller, Newton Jose Cavalieri, Rob Bell, Roma Agrawal