The idea behind this book is fascinating. What would happen to the earth if every human disappeared? Weisman takes us step by step through various regions of the planet and shares a timeline of how nature would reclaim her territory. Something he does that I thought was very interesting was sharing the stories of places that have been abandoned over the years, and how people have gone into these spaces at a later time and have documented what they found. One negative thing about this book is that Weisman does go off on a lot of tangents. If you aren't paying careful attention, you'll lose track of where you are and how you got there, which was a problem for me.