Structure
The castle was originally constructed in wood, pine primarily, and had attached wings to the east and to the south. It was completed sometime between 1592 and 1599, and was designated a National Treasure in 1931. The reconstructed castle features the main tower (tenshu) only, which is made primarily of reinforced concrete. Its five floors stand 26.6 meters above the stone foundation which, in turn, is 12.4 meters high off the ground. However, in recent years, a gate and a yagura in the ninomaru have been re-constructed out of wood using the original methods.
An excellent example of a hirajiro or flatlands (plains) castle, Hiroshima castle once had three concentric moats in addition to the Otagawa river to the west (now called the Hongawa), which provided an additional natural barrier. The two outer moats were filled in during the late 19th & early 20th centuries, and much of what was once within the castle grounds is now modern urban areas, including homes, schools, offices and shops. A number of secondary castle buildings, towers and turrets once stood, and a Shinto shrine called Hiroshima Gokoku Jinja is located within the innermost moat, having been moved there after 1945.
Within the castle walls, three trees survived the atomic bombing, a eucalyptus and a willow at approximately 740m from the hypocenter, and a holly approximately 910m from the hypocenter. Both specimens are preserved just beyond the Honmaru. Also located inside the Honmaru is the concrete bunker from which the first radio broadcast out of Hiroshima following the atomic bombing was made.
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