National Geographic Traveler Photo Contest Hang Son Doong is located in central Vietnam and is the world’s largest cave. It was only explored for the first time in 2009 and is just now opening up to very limited tourism.
As solid and unshakable as we think our civilization is, its grip on nature is tenuous at best. If any cracks appear in the faces of our buildings or our machines, nature is quick to move in and take over. With this in mind, here are 21 photos of places a