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 - including a modern Italian castle, a seaside house made of refrigerator panels, a floating home that was a ferry boat and a spherical house that revolves with the sun - and find out what makes them all so unique.
This amazing assortment of homes from all over the world includes an Australian house based on the shape of the letter K, one like a giant...
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