![](http://onebigphoto.com/uploads/2013/09/temple-inside-cave-thailand.jpg)
Temple inside Phraya Nakhon cave, Thailand. Photo by: Georgi Iashvili
![](http://onebigphoto.com/uploads/2011/11/largest-cave-in-the-world-vietnam.jpg)
S?n ?oòng cave, Vietnam, as of 2009 it is the biggest known cave in the world. Photo by: Peter Carsten | National Geographic
![](http://onebigphoto.com/uploads/2012/04/worlds-largest-cave-passage-vietnam.jpg)
S?n ?oòng cave was created 2-5 million years ago by river water eroding away the limestone underneath the mountain Where the limestone was weak, the ceiling collapsed creating huge skylights. Photo by: Carsten Peter
![](http://onebigphoto.com/uploads/2011/11/illuminated-cave-pools.jpg)
Illuminated cave pools. Photo by: unknown
![](http://onebigphoto.com/uploads/2012/03/black-hole-of-calcutta-australia.jpg)
Black hole of Calcutta, Australia. Photo by: Carsten Peter | National Geographic
![](http://onebigphoto.com/uploads/2011/12/the-worlds-largest-underwater-cave-russia.jpg)
The world’s largest underwater cave, Russia. Photo by: Viktor Lyagushkin
![](http://onebigphoto.com/uploads/2014/02/castle-within-a-cave-predjamski-grad-slovenia.jpg)
Castle within a cave, Predjamski Grad, Slovenia. Photo by: unknown
![](http://onebigphoto.com/uploads/2013/12/blue-marble-cave-chile.jpg)
Blue marble cave, Chile. Photo by: Robert O’Duill
![](http://onebigphoto.com/uploads/2011/11/mayas-natural-well.jpg)
Maya`s natural well inside cave, Guatemala. Photo by: unknown
![](http://onebigphoto.com/uploads/2012/11/deep-blue-cave.jpg)
Deep blue iced cave, Iceland. Photo by: Orvar Thorgeirsson
![](http://onebigphoto.com/uploads/2013/07/datdawtaung-cave-burma.jpg)
Buddha Temple inside Datdawtaung Cave, Myanmar. Photo by: Lin Tun
![](http://onebigphoto.com/uploads/2013/12/restaurant-inside-a-cave-italy.jpg)
Restaurant inside a cave, Italy. Photo by: Grotta Palazzese