Hang Son Doong skyhole by John Spies. The Son Doong Cave in Vietnam is the biggest cave in the world. It's over miles long, has a jungle and river, and could fit a 40 story skyscraper within its walls. It was discovered by modern man 5 years ago.
People have been crawling around the cavernous mountains of Asia for centuries, but remarkably, the largest cave in the world remained hidden from discovery deep in the forests of Phong Nha Ke Bang National Park in Vietnam until
Photography by Carsten Peter Headroom shrinks in the middle of Hang En as cavers pass beneath a ceiling scalloped by eons of floodwater rushing past. The river shortly reemerges onto the surface, then burrows into Hang Son Doong after a few miles.
The Son Doong cave in Vietnam is the largest cave in the world. A tour inside the cave is something extraordinary; it contains a jungle, a river and it has plenty of room for a skyscraper with 40 floors!