Wanderlust, an UK-based famous tourism magazine regarded Phong Nha as the best cave for fossils.
According to Wanderlust, Phong Nha's magnificent grottos are filled with spectacular stalagmites and stalactites and are distinctive examples of a complex karst landform. This has resulted in underground rivers and the development of a maze of caves. It's no surprise that the caves have been granted UNESCO world heritage status.
Phong Nha is also a fossil-rich site and a location where new caves are still being discovered. The entrance to the 44.5km, nine-cave system is via an underground river that connects with the Son River – tour boats can penetrate inside to a distance of 1,500m.
Phong Nha is situated at the center of Quang Binh province in north-central Viet Nam, 500km south of Ha Noi. There are lots of trekking, kayaking and swimming opportunities locally too. Be sure to lookout for a multitude of beautiful butterflies if you are there in March, April or May.