Photograph by Florin Biscu In this dramatic photograph by Florin Biscu, we see Les Dents du Midi as seen from Champoussin, Switzerland. We also see a hut hanging precariously over the edge of a seemingly steep drop (could just be the angle).
Explore the ancient caves of Hang Son Doong, Vietnam. Hang Son Doong is one of the largest caves in the world and features a fast-flowing underground river. For spelunkers, exploring Hang Son Doong is the equivalent of scaling Mount Everest.