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Goryōkaku

Goryōkaku (五稜郭, lit. 'five-point fort') is a star fort in the Japanese city of Hakodate on the island of Hokkaido.[1][2] The fortress was completed in 1866. It was the main headquarters of the short-lived Republic of Ezo.
Type:  Star fort
Built:  1866  
Builder:  Takeda Ayasaburō  

Goryōkaku  Click to go to Wikipedia