Rare cave pearls in Son Doong Cave at Phong Nha-Kẻ Bàng National Park, Vietnam (© Carsten Peter/Getty Images)
comments,
- Explore enough limestone caves and you, too...""May come across these odd formations
- There are many wonders here inside what is considered the world\s largest cave.""Including a ... forest?
- This region seems to specialize in natural wonders that look strange to Western eyes.""Up and out of the cave, jungle hikers may see this tree-dwelling beast
- Much of this national park is just waiting to be discovered.""Of its 300 caves and grottoes, only about 20 have been surveyed by scientists
