Phong Nha Caves are the complex of 14 grottoes situated in a region of limestone mountains in Ke Bang National Park. Phong Nha cave have a total length of 7,729m. Phong Nha Cave were listed as a World Natural Heritage Site in July of 2003 by UNESCO. The Cham People has used Phong Nha Cave as Buddhist sanctuaries in the 9 and 10 centuries. Visit the cave, you will have a chance to explore the remain of Cham altars and inscriptions inside the cave. Tour is limited to a maximum of 15 travelers.