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Hang Son Doong Image, Vietnam | National Geographic Photo of the Day: A hiker is dwarfed by the massive proportions of

Hang Son Doong Image, Vietnam | National Geographic Photo of the Day: A hiker is dwarfed by the massive proportions of the world's largest cave, Vietnam's Hang Son Doong, in this National Geographic Photo of the Day.

Source: photography.nationalgeographic.com

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