In HGTV's Extreme Homes special, get an up close look at some of the world's most unusual houses.

The word extreme means different things to different people, and to these homeowners it means pushing the envelope as far as possible. From construction to completion, take an up-close look at some of the world's most spectacular houses ever built, from a castle made entirely of mud to a home shaped like a sphere, from one built deep in a cave to a home that looks like a snake, and find out what makes them all so unique.

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