King Sejong The Great Memorial Hall was established in Dongdaemun-gu, Seoul, on November 1970 in memory of King Sejong and his saintly virtues and great achievements. Officially opened to the public in October 1973, the memorial hall is a modern structure housing an exhibition area, auditorium, laboratory, and a reference room. The exhibition area is further divided into the Hangeul Room, Science Room, Traditional Music Room, King Sejong Art Room, and an outdoor exhibition space.