In Pictures

"Because Little Boy was an air burst 580 meters (1,900 ft) above the ground, there was no bomb crater and no local radioactive fallout. However, a burst of intense neutron and gamma radiation came directly from the fission of the uranium." 

 Al Jazeera: Atomic bomb in 1945: A look back at the destruction - This week the world remembers the fateful attack on Hiroshima and Nagasaki that changed the world forever.