Border Pass Tunnel of Song and Liao Dynasties is located in Xiongxian County, Baoding City, Hebei Province. Xiongxian County is the ancient city of Xiongzhou. Border Pass fortress was built in Northern Song Dynasty. It is a place for military strategists to contend for. Waqiaoguan, one of the "Sanguan" Pass in history, was located here. More than 2000 years of history has bred a profound war culture, Xiongxian left many war relics, of which the Song and Liao Border Guangu Tunnels are the most typical. Since 1964, Qigang, Guzhuangtou and Xingcun in Xiongxian County have successively found caves with green brick structure due to irrigation and soil extraction activities. The caves were identified by experts as underground passages for military defense in Song and Liao Dynasties, and were confirmed by further actual exploration. Modern people are amazed and ashamed of themselves. It's super cool inside the artifacts. The 20 yuan ticket is really worth seeing in a good place for summer vacation.