Introduction to Guo Shoujing Memorial Hall: Guo Shoujing Memorial Hall is located in Huitong Temple on the northern edge of the West Sea. Guo Shoujing, an astronomer and hydraulic scientist of the Yuan Dynasty, once presided over the water conservancy construction design of the national water system here for a long time. The memorial hall is divided into three exhibition halls, which allow visitors to learn about Guo Shoujing's life, the history of Shichahai and Jishuitan, and an overview of Beijing's water conservancy projects in the Yuan Dynasty.