A World Within Our World: Hang Sơn Đoòng | Weird Places

Hang Sơn Đoòng in Phong Nha-Kẻ Bàng National Park is the largest known cave in the world, big enough to have its own jungles, weather, and... pearls?

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Sources:
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http://www.ryandeboodt.com/images/Han...
http://caves.org/pub/journal/PDF/V65/...
https://www.cambridge.org/core/books/...
https://www.researchgate.net/profile/...

Image Sources:
https://www.flickr.com/photos/1876254...
https://www.istockphoto.com/photo/gru...
https://www.istockphoto.com/photo/cav...
https://www.videoblocks.com/video/wat...
https://www.istockphoto.com/photo/wat...
https://www.istockphoto.com/photo/cav...
https://www.istockphoto.com/photo/wor...
https://www.istockphoto.com/photo/han...
https://commons.wikimedia.org/w/index...
https://en.wikipedia.org/wiki/File:So...