This is a large cave inside one of the many limestone mountains of the Guilin area. This particular one is in Seven Star Park. The choice of lighting can be a little bit gaudy at times, but it was still an amazing place to be, not least because it was an even 20°C inside, and stays at that all year round (good for making very strong rice wine in the guide told us).
As I left I got a look at the park Panda enjoying his nap away from the mid-day sun, in his enclosure. He fell asleep in the middle of his lunch, so the bamboo leaves are still in his mouth (a very a agreeable way to nod-ff I think).