Capri, Italy - Life is centered on the water in Capri, an Italian island in the Tyrrhenian Sea. A popular vacation spot for Italians, the island boasts a classic Mediterranean landscape and is an easy day-trip from Naples and Sorrento.
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.