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.
Sheep graze above a black volcanic sand beach in Vik, Iceland.This is one of the worlds most beautiful beaches according to national geographic. The only non tropical beach on the list. Black volcanic sands make it look weird! (by olopez)