Modern living meets subterranean splendor in this gorgeous home nestled inside of a 15,000-square foot sandstone cave in Festus, Missouri. Built by Curt and Deborah Sleeper, the underground abode features modern interior spaces that blend with the beautiful unfinished sandstone walls to create an incredible example of energy-efficient architecture. Geothermal heating and smart passive design keeps the interior comfortable while completely eliminating the need for a furnace or air conditioning.

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Post tags: "sustainable architecture", curt and deborah sleeper, festus misourri cave home, geothermal heating, Green Building, green design, green renovation, passive solar design, subterranean residence, sustainable design, underground home