the waitomo caves of new zealand’s northern island, formed two million years ago from the surrounding limestone bedrock, are home to an endemic species of bioluminescent fungus gnat (arachnocampa luminosa, or glow worm fly) who in their larval stage produce silk threads from which to hang and, using a blue light emitted from a modified excretory organ in their tails, lure in prey who then become ensnared in sticky droplets of mucus.

photos from spellbound waitomo tours, forevergone, blue polaris, and martin rietze. (more cave photos) (more bioluminescence photos)

(via dan632-deactivated20140619)

Grotte di Castellana, Italy
submitted by: its-the-jelly-man, thanks!

Amazing Underground  (Hang En, Vietnam) | (by Ryan Deboodt)
Paradise Cave, Phong Nha National Park, Vietnam
submitted by: in-my-atmosphere, thanks!
Cenote Ik-Kil
Cancun, Mexico | by chris-tina
Cueva Ventana, Window Cave. Puerto Rico
submitted by: riahrue88, thanks!

Praia Dona Ana | by Marko Stavric | Website.


the reed flute (or karst) cave in guilin, southern china, was carved out of the karst limestone mountains over 180 million years ago from an underground river and that has now settled into a lake. more than 70 ink inscriptions dating back to 792 ce can also be found inside the cave, which was left forgotten for a thousand years before being rediscovered in the 1940s by a group of refugees fleeing japanese troops. photos by james p. nelson, christian ortiz, jesse estes, adam allegro, filip m.a.

(via andycath)

Natural Architecture
Houping Tiankeng Group, Wulong, China | by Queensy Chan
Indian cave
Pinar del Río, Cuba
submitted by: malecosha, thanks!
Cave Swim
Carmel-by-the-sea, California, USA | by Kevin Russ

Grotta Azzurra in Capri | by Ben Fohrer.
Kayak in the Emerald Cave - Arizona, USA | by Pete Piriya

Cave Rafting - Qingyuan, China | by Melinda

Opaque  by  andbamnan