Phenomenal caves are hidden in the Vietnam’s dense tropical forest. Phong Nha-Ke Bang National Park comprises of the ancient major Karst area located in Asia which is said to have been setup in the Palaeozoic Era. Discovering a cave is being regarded as the longest and largest in the Phong Nha-Ke Bang National Park. However, it is learnt in later period that another colossal cave is discovered. Interestingly, the National Park provides shelter to the World’s largest cave and the other beautiful caves. Keeping in mind the geological values, the UNESCO has given it the name of ‘World Heritage Site’.