The whole city of Hiroshima is built around the monument area, doesn't have the same railway system as the rest of Japan either, street cars and lots of underground walkways.
On the other side of the river is the Honkawa Childrens School Museum, which is the bombed out building located on the original campus, which is still an operating school.
The museum is well put together, in many respects better than the memorial museum
The school was thought to be safe because of the deep basement, 400 kids huddled inside this tiny basement and they were all vaporized instantly.
It was fuckin hot, 100* 100% humidity. But while I was there I could hear the children singing next door in the gym, made the room feel very very cold.
The only building unharmed during the blast was the First National Bank of Japan. The building is made entirely from marble.
The bank is now a modern art museum, featuring different artists works, some photos, drawings, music, etc.
The vault space is no fuckin joke, and even though it's 100' under ground, and 5' thick, everyone in the vault area were turned to shadows too.