The Waitomo Glowworm Caves are located in the southern Waikato region of the North Island of New Zealand. These caves are known for their population of glowworms, a species that is found exclusively in New Zealand. There are several small underwater lakes that were created by freshwater creeks or brooks. The unusual light inside the caves comes from the tiny glowworms creating a sky of living lights. You do not have to be afraid of them, because glowworms do not bite.