Introduction to Taixuan Ancient Cave: Taixuan Ancient Cave is also called "Dragon Chuan Cave" and "Zhenren Cave". It is said that this cave is 40 miles long and leads directly to Huangbao Town, the old porcelain field of Yaozhou Porcelain in Tongchuan. It is called Hou Cave. It is said that when incense is burned in Taixuan Cave on the second day of the second lunar month, smoke comes out of the back cave. Therefore, the folk proverb goes: Burn incense in the front cave and smoke comes out of the back cave.