If humans disappeared from Earth overnight, how long would it take to erase the marks we've made on the planet? Journalist Alan Weisman says that within days, New York City's subway tunnels would flood and skyscrapers would start to crumble. However, plastic bags would stick around for much longer. Weisman traveled the world to speak with experts and visit abandoned sites like Chernobyl for his new book, The World Without Us.

The World Without Us is available for purchase at amazon.com