Imagine a world of underground rivers, thousands of extensive caves, cascading waterfalls sparking into vast cavernous sinkholes, and you'll have only scratched the surface Phong Nha-Ke Bang National Park. It's located by the tiny village of Son Trach in north-central Vietnam, 43 kilometers west of Dong Hoi, and some 500 kilometers south of Hanoi. Marked as a UNESCO …
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