Hiroshima Castle was originally built by Terumoto Mori on the Ota-gawa delta in 1589. He named the surrounding flatlands Hiro-Shima, meaning "wide island," and it stuck. The Imperial Japanese Army used the castle as headquarters in World War II, and with its significant depot of munitions it was one of the targets of the bomb. It was destroyed in the blast. In 1958 the five-story donjon (main tower) was rebuilt to its original specifications. Unlike many castles in Japan, it has lots of brown wood paneling that gives it a warm appearance, and it stands in intriguing contrast to the modern city that has evolved around it. The modern interior feels anything but castle-like, but has exhibits from Japan's feudal Edo period (17th–19th century). It's a 15-minute walk north from the A-Bomb Dome.
21–1 Moto-machi, Hiroshima, Hiroshima-ken, 730-0011, Japan