December 28, 2015 1:50 PM

Atop an Ozark mountain, Chateau Pensmore is a mansion built for millennia

At 72,000 square feet, Chateau Pensmore is one of the largest houses in the U.S.

Steven T. Huff built the all-concrete house on a mountain south of Springfield, Mo.

He says it will serve as a family home and a lab for environmental sustainability

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