Goryōkaku was designed in 1855 by Takeda Hisaburō. His plan was based on the work of the French architect Vauban. It is shaped like a five-pointed star. This allowed for greater numbers of gun emplacements on its walls than a traditional Japanese fortress, and reduced the number of blind spots where a cannon could not fire.
Today, Goryōkaku is a park. It has been declared a Special Historical Site and is home to the Hakodate city museum. The grounds are a favorite spot for cherry-blossom viewing in spring.
- List of Special Places of Scenic Beauty, Special Historic Sites and Special Natural Monuments
- Benten Daiba, another key fortress of the Republic of Ezo.
- Citadel Hill, a similar shaped fortress in Nova Scotia, Canada
- Schmorleitz, Morton S. (1974). Castles in Japan. Tokyo: Charles E. Tuttle Co.. p. 144. ISBN 0-8048-1102-4.
- Motoo, Hinago (1986). Japanese Castles. Tokyo: Kodansha. p. 200 pages. ISBN 0-87011-766-1.
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