Mount Longhu (龙虎山, Dragon Tiger Mountain) near Yingtan is the birthplace of Celestial Masters Taoism, the tradition founded by Zhang Daoling in the 2nd century AD. The Shangqing Temple here was once the most powerful Taoist institution in China, and the mountain remains one of the four sacred mountains of Taoism. Most of what you see today is modern reconstruction, but the Taoist atmosphere is genuine and the landscape is spectacular on its own terms.
The geology is the other reason to come. Longhu is part of the China Danxia UNESCO World Heritage Site — a series of red sandstone formations eroded into sheer cliffs, pillars, and narrow gorges along the Luxi River. The cliffs are studded with ancient coffins of the Guyue people, placed in cliff-face niches roughly 2,500 years ago. No one has fully explained how the coffins were placed there; the current theory involves lowering them from above. The slow boat along the river, with guides pointing out formations and performing acrobatic demonstrations from the clifftops, is theatrical but effective.
The nightly sound-and-light show projected on the cliffs is unabashedly dramatic — worth seeing once if you're already there. Yingtan, the nearest city with a high-speed rail station, is about 30 minutes away by local bus. Longhu pairs naturally with Jingdezhen, a couple of hours to the north.