With a cave height of over 200m, a width of 150m and a length of at least 5km and yet to be discovered, Son Doong cave in Vietnam is considered the "first wonders", the largest natural cave. gender. Son Doong has an underground river inside, has its own climate, has a forest large enough to hold a skyscraper in New York.
Australian photographer John Spies has spent a week to make the photo in Son Doong cave.
Video: Discover the magical beauty inside Son Doong cave