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Climb up the Great Wall of Vietnam, if you dare
By Thanh Nien News -
The towering wall of 100 meters high is deep inside the world's largest cave Son Doong

 The Great Wall of Viet Nam is a stalagmite wall of nearly 100 meters high near the end of Son Doong, which is the world’s largest cave in the central province of Quang Binh. Photos credit: Ryan Deboodt/VnExpress
 The wall is six kilometers deep into the cave and has been praised by explorers as a masterpiece of nature.
Tourists have to use special equipment and closely follow experts’ instructions if they want to conquer the wall. 
A spider in the cave. 
A sand bubbler crab in the cave. 
 Fossilized goat bones from several hundred years ago.
Beyond the wall is another 600 meters of the cave and the exit.