Located at the American Museum Of Science & Energy in Oak Ridge, Tenn., this modular home is one of the many built in Oak Ridge during WW2 for workers on the Manhattan Project. These were simple, but quick and cheap to build. At one point, 1,000 per month were going up in Oak Ridge. There were several layouts available. Also during that time, Americans were encouraged to plant 'Victory Gardens' to help out with food rationing during the war effort. Many of these 'Flat Top' houses still exist and are still in use in Oak Ridge today, even though they were labeled as 'temporary housing'. A lot of them have been added on to, and a lot have had peaked roofs added, as well.