Son Doong, a cave belongs to the Phong Nha – Ke Bang grotto system in central Quang Binh Province, has been discovered to be the biggest in the world. Son Doong cave, discovered by a local 18 ye… more →
Vietnam Travel Tipswrote 2 years ago: Son Doong, a cave belongs to the Phong Nha – Ke Bang grotto system in central Quang Binh Provi … more →