What power spot?
The cave may have an image of a place surrounded by dark, inorganic rocks. However New Zealand, there is "a place full of light" that changes the image of such a cave. A pale light shining in the darkness of the Waitomo Caves (Waitomo Caves) is like a planetarium. The "Firefly" found in some areas of the Japan can be seen in this cave. To be exact, it is called "The Dirt Firefly", and it is a companion of "Hikarikinokovae" rather than "Firefly" and "Fly" strictly saying.
-Hikarikinokovae (Light mushroom flies) is a generic term for insects classified as the fungus gnats of Hikarikinokovae.This larva is known as the soil Glowworm to emit a pale light, and is considered to be one of the cave tourism resources in the Australia and the New Zealand, and it is written like that in the Sightseeing field (Tour pamphlet, Tour site, etc.). -From Wikipedia
However, it emits "pale light" like the Firefly of the Japan, and it shines and is enveloped in a mysterious atmosphere in the cave. Like the natural illuminations, it heals the hearts of people who have visited.