A long time ago, well, 7 years ago, I lived in Hiroshima. Not one of my best memories of Japan, but it set me on the course I am on now.
Anyways, about two hours south by local train, and 15 minutes by Shinkansen in the city of Iwakuni. It is an odd little town that is divided into three parts. There is the factory part of town to the north, a military base/airport in the east, and some of the most beautiful rural areas to the west.
Also in Iwakuni is a part of the city rich in history with a castle and a famous bridge named Kintai-kyo.