Some rock formations in Crystal Cave are a half-million years old. The lowest point, Devil's den, is 155 feet (47 m) below the Earth's surface and in it live thirty to forty North American brown bats. The highest point in the cave is 65 feet (20 m) below the Earth's surface, in an area that is called "Lookout Point", for it gives a view of two-thirds of the cave. The cave remains at 52 °F (11 °C), 54 °F (12 °C), and 56 °F (13 °C) in different areas all year round. From the main entrance of the cave to the back of the cave, it measures 500 feet (150 m) long. One rock formation is called "The Upside-down Ice Cream Cone", for the different-colored calcite deposits that look like vanilla ice cream and chocolate ice cream, along with moss and plant life that looks like mint ice cream. Also, there is an enormous drop rock that separates a room in two creating a natural bridge.