According to the recent publication of the BuzzFeed – a New York-based website, the Son Doong Cave in Quang Binh Province of Vietnam is ranked 5th among the 27 surreal places that you should visit before you die.
Son Doong is the world’s largest cave, created 2–5 million years ago by river water eroding away the limestone underneath the mountain. Where the limestone was weak, the ceiling collapsed creating huge skylights. A half-mile block of 40-story buildings could fit inside it!