Hiroshima was a castle town that was built around a river delta the in the year 1589. is most relevant for being the very first place that was hit with an atomic weapon in history, showcasing the devastating potential of the weapons. The bombing of Hiroshima killed anywhere from 90,000 to 166,000 people, including allied prisoners of war. Alongside the bombing of Hiroshima, the United States issued a warning that it would issue “complete and utter destruction” against Japan if they did not immediately surrender. Since the war, Hiroshima has rebuilt itself as the capital of Hiroshima prefecture and is now the second-most populated city in the most west area of Japan. Despite this, the bombing is a deep scar in the hearts of many Japanese people, and has been the source of inspiration for countless pieces of art. The bombing of Hiroshima is noted as one of the most known war crimes in history, alongside the subsequent bombing of Nagasaki.

https://en.wikipedia.org/wiki/Hiroshima
https://en.wikipedia.org/wiki/Atomic_bombings_of_Hiroshima_and_Nagasaki