The Rafflesia flower ~ biggest flower in the world! Can reach 90 centimeters in length, Rafflesia is a parasite that depends completely upon its host plant, the flower taking months to develop may last only a day.
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.