This is an actual cave in New Zealand. It is illuminated by glowing worms (Arachnocampa

I've been there and you're not allowed to take photos...

I've actually been there and its great. Just relaxing in a boat and looking at the ceiling covered in bright blue spots. Kinda hard to explain how actually beautiful it is...

The Cave of Two Lovers.

I wish I were a glow worm,
Glow worms have such fun,
'Cause how could you be grumpy
When the sun shines out your bum?

(A) Harvest Glowing Mushroom