Caves! Oh my! A trip to Vietnam is not complete without a visit to Phong Nha-Kẻ Bàng National Park and its caves. The park has 300 caves and grottoes and was created to protect the karst region which is one of the largest in the world and the oldest in Asia at 400-450 million years old. The park also boasts the largest cave in the world, Sơn Đoòng, which was discovered in 2009 and is big enough to hold a New York City block with 40-story skyscrapers. We have visited a few caves before, but we have never seen anything like this before.
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