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Photo: A photo of swimming in Ken Cave (part of the Tu Lan cave network) by Carsen Peter is among the eight most-beautiful cave pictures in the world as selected by the renowned National Geographic magazine.
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Photo: Inside Son Doong Cave.
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Photo: Inside Son Doong Cave.
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Photo: Inside Son Doong Cave.
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Photo: Entrance to Son Doong Cave.
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Photo: Inside Son Doong Cave.
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Photo: Inside Son Doong Cave.
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Photo: Inside Son Doong Cave.
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Photo: Inside Son Doong Cave.
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Photo: Inside Son Doong Cave.
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Photo: A campsite in Son Doong Cave.