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Tucked beneath a grassy roof covered by nearly 200 species of plants and grasses, the structure is virtually invisible from the nearby street. In fact, the 1,400-square-foot house is so well hidden in the earth that it doesn’t seem to register on the radar of local wildlife either. Birds, butterflies, bees, dragonflies, hawks, snakes, lizards, and frogs all treat the house like just another grassy knoll.