When Vietnamese farmer Hồ Khanh stumbled upon this cave in 1991, it was immediately clear the gaping mouth led to a huge, dark, untouched chamber, complete with a free-flowing underground river. What couldn"t have been apparent to him then was that this cave, now known as Sơn Đoòng, is by far the world"s largest by volume.
A universe underground
Today in History
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Tibetan New Year
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Stepping stones in Tollymore Forest Park, Northern Ireland
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Stepping into autumn
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Stari Most in Mostar, Bosnia and Herzegovina
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World Lizard Day
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Schönbrunn Palace Park, Vienna, Austria
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Lake Magadi, Kenya
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A place fit for the gods
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Great Salt Lake Shorelands Preserve in Layton, Utah
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World Theater Day
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Pacific Park, Santa Monica State Beach, California
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Endangered Species Day
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Atrani, Amalfi Coast, Italy
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Think deep thoughts
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Protecting endangered giants
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International Day for Biosphere Reserves
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Bournemouth beach huts
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Prasat Phanom Rung temple ruins, Thailand
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Grand finish of Le Tour
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A day to celebrate the sun
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Red deer stag in Glen Affric, Scottish Highlands
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Not your average sandcastle
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World Oceans Day
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Floating market, Kaptai Lake, Bangladesh
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Oktoberfest
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International Day of Peace
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The scene of a literary crime
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Rock of ages
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Goodbye, 2020!
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Dunes at White Sands National Park, New Mexico
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