The largest cave in the world: a city hidden in the bowels of the earth.
Hang Son Dong in Vietnam is more than just a cave.
It is an underground world so huge that it could fit the skyscrapers of New York City.
And an entire Boeing 747 could fly through its cave halls without hitting the walls with its wings.
The largest hall of the cave is about 5 kilometers long, 200 meters high and 150 meters wide.
This cave is so large that it has even formed its own ecosystem inside, including a river, jungle and clouds.
Ancient stalactites and stalagmites reach over 80 meters high.
And all the walls of the cave contain traces of time that are more than 3 million years old.
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