Located in the eastern suburbs of Huangshan City (12 km from the downtown area), Huashan Mountain Mysterious Grottoes is a comprehensive tourist attraction with connotations. It is the largest ancient man-made grotto group ever discovered in China. There are 36 grottoes of various sizes, all of which were constructed in the ancient time. Inside the grottoes are numerous fine patterns left by the ancient workers.

The grotto group lines up at the foot of Huashan Mountain by the Xin'an River. Their structures are unusual, and their inner cavities, enormous. For example, some grottoes have another one inside; sine are filled with stone pillars; the others contain only tranquil pools, with neither mural paintings and Buddhist statues nor carved words. Two grottoes are even more amazing - they have their exits and entrances opening directly into the waters of the Xin'an River!