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

Episode HEXHS-104H

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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.