Inside the Main Building, the story is told through models, images and photo panels. You will see Hiroshima before and after the bombing, the background to the atomic bombing, the reality of the nuclear age, and the city's own peace efforts. Together these panels give you the full arc, from the city as it was, to the day that changed it, to the question of what comes next. Then there are the artifacts. These objects and materials convey what specifically happened to Hiroshima on August 6, 1945. At 8:15 in the morning that day, a United States B-29 bomber, the Enola Gay, dropped the first atomic bomb ever used in war. The bomb, called Little Boy, killed about 140,000 people. Seen in that light, a single everyday belonging on display becomes a very direct way into a very large number. The building also has a video theater where documentary films can be viewed. Down on the basement floors are exhibition rooms for paintings of the bombing made by surviving citizens, drawn from memory by the people who lived it.