A majestic and stunning scenery in the Son Doong cave will exceed your imagination and artists’ creationRecognized as the largest natural cave in the world, Son Doong in Quang Binh contains many secrets which scientists have not encoded. This is also an interesting site which foreign tourists are happy to pay a price of $3000 to visit, but have to wait until 2016 as the tour is full to at that time.1. Found in the rainy dayIn 1991, Ho Khanh – a local man incidentally discovered Son Doong cave when he was avoiding rain in the cave. Not until 2009, did the expedition of British Royal Geographic Society come to discover...