15 mind-bending buildings that defy gravity

Looking at these strange, gravity-defying buildings makes one ponder: are the architects bored, on drugs or just plain crazy? No matter the state of mind of their creators, one thing is for sure Ô these structures certainly are crowd pleasers. Here's a rundown of our favorites from around the world.

Below you'll see buildings that have been already built and are bending minds all the world over, as well as just a few concepts that could be a realized structure sometime soon.

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