Ghost Cities of 2100

Most of today's cities seem pretty sturdy. Indeed, the possibility that they might crumble to dust seems to be less of a concern than how nations will cope with the rise of so-called "megacities," cities with populations of more than 10 million: Tokyo, New York, São Paolo and Mumbai are already around twice that size or bigger.

But could the opposite problem occur? Could some of our cities vanish as thoroughly as Moenjodaro did?

From Forbes