How's this for a rooftop garden house? French architect and designer Patrick Nadeau looked underground, so to speak, for this unusual home near Reims, France. Well, it's not totally underground per se - it takes shape as a hump, featuring a curved roof that's covered by a carpet of plants and wildflowers which give it that wonderful "underground" look and feel. This innovative house combines the fields of architecture and landscape in one stand-out design. Check it out!