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https://visithiroshima.net/things_to_do/attractions/historical_places/hiroshima_castle.html
21-1 Moto-machi, Naka-ku, Hiroshima City, 730-0011 Phone : +81-(0)82-221-7512 Opening Hour : 9:00 a.m.-18:00 p.m. ( March-November) 9:00 a.m.-17:00 p.m. ( December-February Weekday) Entrance is closed 30min earlier.
https://www.japan-guide.com/e/e3402.html
Important Notice: Hiroshima Castle was closed due to the coronavirus but reopened on October 1, 2021. Hiroshima Castle (広島城, Hiroshimajō), also called the Carp Castle, is a good example of a castle built on a plain in the center of a city as opposed to hilltop and mountaintop castles.
https://www.kanpai-japan.com/hiroshima/castle
Open every day from 9 a.m. to 6 p.m. (until 5 p.m. between December and February) Last admission 30 minutes before closing time; Annual closing from December 29 to 31; Ninomaru: Open every day from 9 a.m. to 5:30 p.m. (until 4:30 p.m. between October and March) Last admission 30 minutes before closing time; Annual closing from December 29 to January 02
https://www.tripadvisor.com/Attraction_Review-g298561-d320344-Reviews-Hiroshima_Castle-Hiroshima_Hiroshima_Prefecture_Chugoku.html
The Castle Tower itself is open 09:00 ~ 17:00. I am not aware of any opening/closing times for the Main Compound but their website indicates that the Castle is lit from sunset until 22:00, which suggests that it maybe still accessible after dark.
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