Riding a bicycle, basically relying on the map to find. A person quietly looked at the objects and pictures, and introduced that many places here are real. For the first time, when I came to the basement, I saw Dr. Bethune's operating table, as well as the underground telegraph, the hand-powered engine covered with cotton quilt, which was originally seen in books, at most on TV. When I saw it with my own eyes, I was still very sad. If you have time, it's worth visiting here.