Pigs break loose, rabies spreads, and the Chicago river reverses. Also, the fate of Big Ben, the Queen's pet corgis, and Chicago's tallest buildings. This episode is a journey that will take us to the future of Chicago, Atlanta and London--as well as haunting locations already devoid of man. This isn't the story of how we might vanish--it's the story of what happens to the world we leave behind.

Once people disappear, New York City experiences its next great crash. In this episode, we reveal the breaking point of precious metals: skyscrapers face collapse, bridges hang by a steel thread; and the fate of our nation's secret stash of gold. Meanwhile, a fatal weakness is exposed in the Gateway Arch, breweries reveal untapped potential for disaster, and horses make a surprising bid to stay alive in a life after people.