On this episode of Our American Stories, in 1943, the U.S. government transformed farmland outside Oak Ridge, Tennessee, into a top-secret city of 75,000 people racing to build the atomic bomb before Nazi Germany. Cameras were forbidden, except for one.

Richard Cook, author of Ignored Heroes of World War II: The Manhattan Project Workers of Oak Ridge, Tennessee, shares the remarkable story of photographer Ed Westcott, whose images became the definitive visual record of America's greatest wartime secret.

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