How’s a house shaped like a mushroom sound? What about a home with no corners, or a humble abode tucked into a cave? While it might seem like the United States is stuffed with cookie-cutter dwellings, some homes break the mold in a big way. These unique places might be a tough sell, but they represent the blood, sweat, and tears of builders who dared to think outside the box (and brick). Here are some of the most, er, unique homes from coast to coast, including Indiana's contribution — the so-called "ugliest home in America" — which finally just sold for a fraction of its original listing price.