Abandoned buildings can be strange, romantic, mysterious, creepy and even dangerous, or all of those things at once. So, perhaps not surprisingly, visiting them has become something of a cult sport. But to anyone in the commercial real estate industry, abandoned buildings represent elaborate failures. They remain standing as repositories of the stories surrounding them, not only of what was, but of what could have been. Here are 10 of the world's biggest and most storied (in height and legend) abandoned buildings.