Visitors look at a full scale mock - up of Little Boy , the atomic bomb that was dropped on Hiroshima in 1945 , at the Hiroshima Peace Memorial Museum , western Japan , 04 August 2007 . The 62 th anniversary of the world ' s first atomic bombing during World War Two will be commemorated on 06 August . EPA / KIMIMASA MAYAMA < 저작권자 ⓒ 2007 연 합 뉴 스 . 무단 전재 - 재 배포 금지 . >