Hirosaki Castle is a hirayama-style Japanese castle constructed in 1611. It was the seat of the Tsugaru clan, a 47,000 koku tozama daimyō clan who ruled over Hirosaki Domain, Mutsu Province, in what is now central Hirosaki, Aomori Prefecture, Japan. Hirosaki Castle measures 612 meters east-west and 947 meters north-south. Its grounds are divided into six concentric baileys, which were formerly walled and separated by moats. It is unusual in that its Edo period donjon and most of its outline remains intact. Noted historian and author Shiba Ryōtarō praised it as one of the "Seven Famous Castles of Japan" in his travel essay series Kaidō wo Yuku.
The current donjon of the castle was completed in 1811. It is a three-story building with three roofs, and a height of 14.4 meters. The design is smaller than early Edo-period varieties of donjons, and it was built on a corner of the inner bailey on the site of a yagura, rather than the stone base of the original donjon. The small size was partly due to the restricted finances of the domain towards the end of the Edo period, but its location and design were also intended to alleviate concerns which might be raised by the Tokugawa shogunate should a larger structure be built. At present, it is a separate standing structure; however, prior to 1896 it had an attached gatehouse. The donjon is surrounded by three surviving yagura from the Edo period, on its second bailey, and five surviving gates in the walls of its second and third baileys. All of these structures, including the donjon itself, are National Important Cultural Properties.
The surrounding Hirosaki Park around the castle grounds is one of Japan's most famous cherry blossom spots. Over a million people enjoy the park's 2600 trees during the sakura matsuri when the cherry blossoms are in bloom, usually during the Japanese Golden Week holidays in the end of April and beginning of May
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