Take an Epic Jungle Trek To Phong Nha, the Biggest Cave System in the World
Phong Nha is a district in Quang Binh province, Vietnam. It is best known for its magnificent and mysterious caves, some of which date back millions of years. The most famous is Paradise Cave (Thien Duong), and Phong Nha Cave (Son Doong). There are also hundreds of smaller limestone cave systems throughout the region. And getting to most of them requires an amazing hike through the Vietnamese jungle.