Natural Wealth of Vietnam
This biggest natural wealth of Vietnam, known as the Son Doong, the largest cave in the world, is located in the heart of the rainforests in Vietnam. During the war with America it stood for the General Headquarters that housed even a few battalions. It was a large military hospital, ammunition storage, a center of communication, and now is the center of world speleology. Take a look at the pictures because they can show only a part of the greatness of this cave.