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Ever wonder what a underground river that runs through a mountain with lime stones inside over the years? Here it is, This is the Son Doong Cave, considered to be the largest cave in the world. This cave is found in Vietnam, particularly in the Quang Binh province. The river slowly eroded the lime stone of the mountains for over 2-5 million years and made this amazingly large cave. The entrance was discovered due to the ceiling of the cave collapsing, this cave is so large that even a 40-story building can fit and then some. So, if you ever want to adventure in caves, make sure that the Son Doong Cave is on your Bucket-List for cave exploring.