Stretching over 400 meters with a vertical drop of more than 100 meters, Mystery Valley was formed by the collapse and accumulation of granite blocks from the surrounding peaks. Within the valley, colossal boulders are scattered in a structured yet artful disarray, creating a labyrinth of interconnected caverns. Its enigmatic atmosphere has earned it the reputation of the "No. 1 Secret Granite Chamber in China." Originally known as Siyuan Cave, it was said to be the divine abode of the Lord of Fate (Siming Zhenjun), and thus revered in Taoism as the Siyuan Cave-Dwelling. The valley is divided by terrain into four distinct sections: the Xiaoyao Palace, the Labyrinth, the Dragon Palace, and the Heavenly Palace. Each palace possesses its own unique character and is cherished by Taoists as a "Grotto-Heaven of Bliss."