Zhanggong Cave, located in Yixing, is a masterpiece of nature. Legend has it that Zhang Guolao (a legendary figure associated with the Chinese people) once lived here. Parking is convenient and costs 15 yuan. The entire scenic area consists of a karst cave, rafting, an underground river, and a pottery workshop. It's perfect for summer visits. The cave has four levels, with a year-round temperature of around 10 degrees Celsius. After exiting the cave, there's a Taoist temple and a God of Wealth temple where you can offer incense for free.