In the ancient town of Hekou on the Yellow River, 47 kilometers from the center of Lanzhou. Into the ancient town of Hekou, it is understood that the locals said: in the Paleolithic period 200,000 years ago, there are traces of human activities, the Tang Dynasty set up Guangwu, the Song Dynasty called Yanlong, Yuan Ming called Zhuanglanghe Fort. Here, there was the former Shaanxi-Gansu Customs, and Zuo Zongtang also used it here. People cant help but walk through the ancient town and cross the millennium.