Glow Worm Cave -> Explore a 12000 year old cave system and see 100's of tiny glow worms in a magical underground experience.Imagine you're floating on a small wooden boat through a damp cave. It's completely dark inside, save for dots of light from the bodies of a thousand teensy blue insects. Their electric-looking selves create a Milky Way of color above your head. Glowworm caves, New Zealand.