Tianxin Cave is located on the foothills of Qionghua Mountain in Shuitou Town of Nan'an. It was built in the Sui Dynasty (581-618 AD) and is one of the four ancient temples in Nan'an. Tianxin Cave, formerly known as Tianxiang Temple, enshrining Sanbao Buddha, is a unique tourist attraction of Taoism and Buddhism. There are four scenic spots in the area: the Taoist temple, Longtan lake, waterfall, and Tianxiang Temple, which are known as the "Attraction of Quannan". The famous Buddhist temple Tianxiang Temple is adjacent to the Tianxin Dong Taoist Temple. The Taoist temple and Buddhist temple are interdependent. According to legend, the famous Zheng Chenggong once went to Tianxin Cave to pray, and the golden body of Yang Xiangong Taiyi Zhenren once went to the Tianxin Cave for a pilgrimage. The place is filled with a very strong religious culture.