To day we traveled to Te Anau and then by boat to the Te Anau Glowworm caves.
Click here for a link.
Glowworms I think are native only to Australia and NZ, appearing like tiny strands of wire, the lenth of a matchstick, hanging from cave walls. A chemical reaction in their stomachs produces a light, becoming brighter as they become hungrier. Insects attracted to the light become their food.
You enter the cave by foot and then proceed for most of the journey by boat.
Your senses are completely overwhelmed, from pitch blackness and silence (no talking is permitted which would frighten the glowworms) to illumination revealing cathedrals and a roar from underground streams cascading down the rocky crevices beside you.
Its like entering a mysterious underground world of weird rock formations, waterfalls and illuminated cathedrals.