You don't need to visit Hiroshima if you doubt.
Do you know that Hiroshima was once destroyed by the atomic bomb?
If you know it and doubt whether Hiroshima is worth visiting, you don't need to visit Hiroshima.
And if you don't know it, follow the links below.
“Hiroshima,the City of Water” Tourism Site Hiroshima Navigator
Visit Hiroshima - The Official Hiroshima Prefecture Tourism Site