The UNESCO site beat other famous national parks such as Ba Vi, Cuc Phuong and Cat Ba in the northern region to make it into the list.
Established in 2000, Phong Nha – Ke Bang is frequently referred to as the "Kingdom of Caves" for its magnificent specimens.
The 900-sq-km national park, which UNESCO recognised as a global heritage site in 2003, is home to over 300 caves and grottoes that date back some 400 million years.
Around 30 caves are now open to visitors, creating a tourism boom and giving much-needed revenue to the once war-torn province.
Son Doong, part of the Phong Nha – Ke Bang National Park, has hogged the international spotlight since it opened to tourists in 2013, four years after members of the British Cave Research Association finished their exploration and declared it the world’s largest.
Last year, Quang Binh welcomed a record-breaking 3.9 million tourists, up 18 percent from the previous year.