1 of 6 On 6 August 1945 the first atomic bomb used in war was dropped on Hiroshima in Japan. This building, now called the A Bomb Dome, survived the blast and today it's a memorial.
2 of 6 The Enola Gay was the US Air Force plane that carried the atomic bomb to Hiroshima. The aircrew dropped the bomb from 600 metres over the city.
3 of 6 The Hiroshima bomb was nicknamed Little Boy. US President Harry Truman hoped the bombings would end World War 2 without an invasion of Japan which it was thought would cost the lives of 250,000 US troops.
4 of 6 Hiroshima was a city of about 255,000 people in 1945. The atomic bomb blast flattened buildings within a 2.5 kilometre radius.
5 of 6 About a third of Hiroshima's population was killed within a week of the bombing. Many more have since died through radiation sickness. Between 2,000 and 6,500 children are believed to have been orphaned by the atomic bomb.
6 of 6 Now, Hiroshima is an important industrial city with a population of 1.1 million. It is home to the Mazda car company.