These cave may look like they are being lit up by man made lights, but the reality is much more awesome. They are actually being compltely lit up by glow worms.
The glow is bioluminescent gnat larva (or arachnocampa luminosa) living on 30 million-year-old limestone formations.
The blue lights, emitted mostly by female larva, is what is believed to be a way of attracting mates. The images were captured by photographer Jospeh Michael using long-exposure equipment. (IFL Science)