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.
As the edge of the moon touched the top of the waterfall the cascade turned the color of the pale yellow moon. Slowly the light touched the river and began to flow down the river. He watched, pensive, as his cloak flapped int he light breeze.