The Rio Frio Cave is one of the most remarkable attractions in the Mountain Pine Ridge Nature Reserve.
Everything is gigantic in this cave! When you enter, you will see huge stalactites hanging from the massive cathedral-like vault which was part of a cave system that the Maya used to bury their dead.
See also: Actun Tunichil Muknal Cave
Room size boulders are strewn throughout the cave and a stream flows through forming pools with cascading falls.
Here is a video that provides an overview of Rio Frio Cave: