Bing Wallpaper: [Teacher's Day: Solitary Search, Bravely Go Forward] Han Song-dong, Phong Nga Bang National Park, Vietnam

[Teacher's Day: Solitary Search, Bravely Go Forward] Han Song-dong, Phong Nga Bang National Park, Vietnam

© Carsten Peter/Getty Images - 2015-09-09

formation cave caving geology speleothem rock coastal and oceanic landforms pit cave

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