《徐霞客游记·楚游日记二》
进入洞内五六丈后，上面镶嵌着围顶，四周石头凌空飞突，洞壁的第二层上如同悬空架着楼阁，若得到两丈高的梯子便可攀到上面。
入洞五六丈，上嵌围顶，四围飞石驾空，两重如庋悬阁，得二丈梯而度其上。
After entering the cave for five or six Zhang, there is a roof inlaid on the top, and the stones are flying in the air on all sides. The second floor of the cave wall is like a pavilion suspended in the air. If you get a ladder two Zhang high, you can climb up to it.