As of 22 March 2026, the castle is closed due to structural deterioration, although the grounds are open are free to roam around. The original Carp Castle (Rijō) was built in the 1590s by Hideyoshi's warlord Terumoto Mōri, predating the city itself. It was destroyed by the atomic bomb, by which time it was serving as a military headquarters, and reconstructed in using modern materials in 1958. Some of the original stone foundations can still be seen. Today, the castle grounds are a nice place for a walk, and definitely Hiroshima's favorite place for hanami (cherry blossom parties), with more than 350 sakura trees. The five-story castle museum is an attractive reconstruction of the 16th century donjon, with interesting relics and armor to see (and try on), as well as some informative displays about the history of the castle and the city. The view from the top is worth the entrance fee all by itself. Photography is allowed for self-use only. Gift shop sells various Warring States period-related goods, while the stamp-collecting area for Japanese Top 100 Castles is outside the castle. No elevators are available - visitors will be walking the five stories by stairs.

Hiroshima Castle (広島城, Hiroshima-jō), sometimes called Carp Castle (鯉城, Rijō), is a castle in Hiroshima, Japan that was the residence of the daimyō (feudal lord) of the Hiroshima Domain. The castle was originally constructed in the 1590s, but much of it was dismantled in the Meiji era, and what remained was largely destroyed by the atomic bombing on August 6, 1945. The main keep was rebuilt in 1958, a replica of the original that now serves as a museum of Hiroshima's history before the Second World War, and other castle buildings have been reconstructed since.