In this picture you can see another of the memorials in the Peace Park.
Hiroshima can also be accessed by Shinkansen, the Japanese Bullet train, from Osaka (90 minutes), Tokyo, (4 hours) and Kyoto (2 hours). You can get to Hiroshima by bus too, but I recommend the Bullet Train. If you are planning on traveling around Japan by train, you can buy a Japan Rail Pass.