Son Doong Cave in the central province of Quang Binh has been ranked sixth among the 10 most beautiful caves in the world by British travel magazine Time Out. With 38.5 million cubic metres of space, the 9-kilometre-long cave is the world’s largest natural cave.

Thien Duong Cave in the Phong Nha – Ke Bang National Park, Quang Binh province, has been recognised as the one with the most unique and magnificent system of stalactites and stalagmites in Asia.