Nagasaki, Japan - 9 August 1945

"Fat Man" was the codename for the type of atomic bomb that was detonated over the Japanese city of Nagasaki by the United States on 9 August 1945. It was the second of only two nuclear weapons ever used in warfare, the first being Little Boy, and its detonation caused the third man-made nuclear explosion. It was dropped from the Boeing B-29 Superfortress Bockscar, named after its pilot, Captain Frederick C. Bock. For the Fat Man mission, Bockscar was piloted by Major Charles W. Sweeney.
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From: http://wikipedia.org