Ground Zero Nagasaki

From the amazingly detailed WWII Timeline over at How Stuff Works:

Results of the Nagasaki atomic bomb attack: Pictured is ground zero in Nagasaki before and after the bombing. Though the city had good bomb shelters, many Japanese had become blasé about air raids and ignored the warning sirens on August 9. Due in part to the hilly topography, damage was confined to an area about 2.3 miles by 1.9 miles. Fire was limited by waterways. Some medical services survived, and even train service continued. The number of deaths was lower than at Hiroshima, with the Japanese government assessing the figure at 25,000. Ironically, Emperor Hirohito was at that very moment trying to decide how to end the war.

Howstuffworks "Japan Surrenders and World War II Ends: June 1945-September 1945"