This is a rare capture of Hang Son Doong Cave in Phong Nha Ke Bang Providence Vietnam. This mystical cave river only appears at the beginning and end of the monsoon seasons which makes the cave impassable. Only two weeks after this shot was taken this river disappeared for the dry season becoming a muddy trench and 200 meters lower.
Cave National Park, Central Kentucky, USA. The longest known cave system in the world. There are over 400 miles of caves that have been explored. 63 Alabama State Parks,The first thing you notice about Cathedral Caverns is the massive entrance.