I don't know what it is about overhead greenery that's so compelling, but Oobject's list of 12 Stunning Rooftop Gardens, a collection of photos culled from around the world, has sent me into a momentary flutter of day-dreaming. The idea of spending an afternoon or early morning strolling about in one of these spaces is utterly alluring. Take a look at a few more after the jump. Which roof is your favorite?

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Waldspirale Complex in Darmstadt, Germany.

California Academy of Sciences.Header: Chicago's City Hall. Homepage thumbnail image by JWilly.