arachnocampa luminosa

The cave glows thanks to thousands of bioluminescent larvae clinging to jagged stone walls.

The fireflies on the 30 million-year-old limestone cave in New Zealand sparkle with light, making observers feel like standing under the starry sky.

These strange phenomena happen every hour for hours around the world. They are great, even just to be seen once in a lifetime, and to travel is even more valuable.