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The Enola Gay, the Boeing B-29 Superfortress bomber that dropped the atomic bomb on Hiroshima in World War II, is so large that it couldn't fit into the Smithsonian National Air and Space Museum's flagship location on the National Mall in Washington, DC.

Instead, it's displayed at the museum's second location, the Steven F. Udvar-Hazy Center in Chantilly, Virginia.

The Udvar-Hazy Center features over 200 aircraft on display, but the Enola Gay remains one of the most prominent objects in its collection.

A second "Fat Man" atomic bomb was dropped on Nagasaki on August 9, 1945, by another Boeing B-29 Superfortress named Bockscar, which is on display at the National Museum of the US Air Force in Dayton, Ohio.

The emperor of Japan announced the country's surrender on August 15.

Tibbets commanded the Air Force's 509th Composite Group in charge of deploying nuclear weapons. The hand-picked squadron trained at an abandoned airfield in Windover, Utah.

To make the B-29 aircraft capable of carrying the atomic bomb, all of its protective and defensive armament, except for the 50-caliber tailguns, were removed to get rid of excess weight. It was also left unpainted, which saved the 850 pounds that the paint would have added.

At least 70,000 people died in the initial blast from the bombing of Hiroshima, and the death toll over five years may have exceeded 200,000 people due to the aftereffects, according to the US Department of Energy's Office of History and Heritage Resources.