Hidden deep beneath the hilly sheep-populated countryside of North Island, New Zealand is a real-life Cave of Wonder.
Funny thing, though, the glow-worms aren’t really glow-worms. They’re actually fly larvae. And what causes the glowing? Excretory organs. These creepy-crawlies produce a silk-like thread used to trap flies and other bugs for them to prey on. And the hungrier they are, the brighter they glow. Pretty neat, but gross.
Tourists can explore the cave by rafting through with a tour group or by floating on a rubber tubing as a part of trekking tours available.