Never mind the idiot commentary... These pictures (and the narration) are very eye-opening.
http://imgur.com/gallery/CdxZM
Sample pic:
At least Nagasaki and Hiroshima are habitable.
EDIT: Thanks to Scanker19, who posted a real article with many pictures and much better narration. I'll put the link here: http://www.theatlantic.com/static/infocus/wwi/century/