The May 18 Memorial Foundation has developed three-dimensional puzzles for teaching materials in history education. These three-dimensional puzzles were planned in series. Its first work, “Old Jeollanam-do Province Hall,” was made in 2019, and the second one, “May 18 Democracy Square and Geumnam-ro,” was made in 2020. This year the third work, “Old Red Cross Hospital,” represented the shape of the building and Gwangju citizens at the time. It can help users to feel the atmosphere in the poor situation and the spirit of caring for the community while putting together the puzzle. Old Red Cross Hospital was the nearest general hospital accommodating numerous patients around the old Jeollanam-do province hall. For that reason, it was designated historical site no 11. The May 18 Memorial Foundation has provided not only three-dimensional puzzles but also various educational materials via its website(http://edu.518.org).