Road introduction: Looking at the mountains is like reading history, and walking into Gaxian Cave is like reading a history book. It allows people to understand a period of history of the ancestors of the Xibe people, and also allows people to see a common people who once created the Chinese nation. The Xianbei people, who have made great contributions to culture, came out of Gaxian Cave, were born in the dense forests of the Greater Khingan Mountains, and grew up in the Hulunbuir Prairie.