This passive-solar structure will have its new owner giving a high-five to Mother Earth, due to the structure’s energy-efficient design. The 2,191-square-foot home in Fairfield, Connecticut, is partially submerged, which keeps things cool in the summer and warm in the winter. The private residence, listed for $695,000, sits on 11.4 acres of apple and pear trees, blueberry bushes and more to explore. Courtesy of specialfinds.com