We’ve featured plenty of beautiful sustainable homes here on 6sqft, many of which include some pretty hi-tech gadgets from geothermal wells to highly reflective roofing materials. But John Grzibowski decided to just use what’s available in nature. He built an Earth-sheltered home in Newburgh, New York that strategically uses the surrounding landscape to insulate itself. The adobe was even built using locally-sourced materials. Why go out and buy expensive technology when we can just use the gifts that Mother Nature gives us?