The Minister's House in Crossville, Tenn., is 10 STORIES HIGH, over 97 feet tall, and supported by six full-grown oak trees. If you're a total purist about your treehouses and believe they need to be entirely off the ground and supported only by limbs, then this doesn't qualify, but screw you because it's awesome. 

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You can see more photos here and here, and you know that you want to.