Son Doong Cave is located in the heart of the Phong Nha Ke Bang National Park in Quang Binh province of Central Vietnam. Only recently explored in 2009-2010, Son Doong Cave has only been open to the public since 2013.
Son Doong Cave - via Amaze and Amuse
(Image credit: commons.wikimedia.org/wiki/File:Son_Doong_CaveDB(3).jpg)
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you can see the hole thing
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