Goryokaku Park is a star fortress city built in the Edo period. It is a castle built in Japan by Western architecture. The castle that has witnessed history now has only the outer walls of the city, and the interior has been converted into a city park. There is a boxhouse in the park, which collects the weapons used in the war and the warrior suits stained with blood. There is also a Goryokaku Tower outside the park. The tower can overlook the whole picture of the Goryokaku Park. The shape of the pentagonal star is clearly visible.