Phong Nha

Late in 1899, the French priest Leopold Cadiere paddled into Phong Nha Cave and found a stele carved with 97 characters, left by the ancient Cham about 1,000 years ago. Its stories ride a boat up the Son River into that cave. They follow Hồ Khanh, an agarwood hunter who sheltered from a storm in 1990 at the mouth of Sơn Đoòng, the largest cave in the world, where a forest grows underground. Then they climb down a 15-meter ladder into the Tú Làn caves near Tân Hóa.