Vietnam already enjoys a global reputation for its gastronomy, beaches, ancient history and diverse landscapes. Over the past decade, it has also become one of the world's major destinations for caving. Quang Binh province, located in central Vietnam, is particularly renowned thanks to Phong Nha- Ke Bang National Park, a UNESCO protected site, also known as the Kingdom of Caves. At its heart is Son Doong, the largest cave in the world, large enough to house an entire New York City neighborhood with 40- story skyscrapers. For fans of exploring the most fascinating underground worlds on the planet, here is an interesting guide to consider
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