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.
"hellooo anyone home?" what a wonderful photo - urbanfragment: “We don’t need a blanket, just saying.” Female polar bear peering into the window of a cabin. Photo by Paul Nicklen (National Geographic) View Post