On this private overnight tour, you will learn history from the artifacts left behind by those who in lived in former warzones during the Vietnam War. You will learn how people prepared and protected themselves from bombings. You will explore the Vinh Moc tunnels, a complex network of tunnels made with basic tools that housed and protected an entire village resulting in no bombing casualties. Besides the grotto and cave systems, Phong Nha has the longest underground rivers, the largest caverns and passageways, the widest and prettiest sand banks, and the most astonishing rock formations in the world.