At 8:15 a.m. on August 6, 1945, the first atomic bomb used in war exploded over Hiroshima. The heat at the center of the blast reached over a million degrees Celsius. It instantly vaporized people close to the hypocenter — leaving behind nothing but their shadows, burned into stone and concrete. One of the most haunting examples is the shadow on the steps of a bank — believed to be all that remains of someone who was sitting there when the bomb struck. These shadows are not just physical marks.