Son Doong cave is located in the heart of Phong Nha - Ke Bang National Park in Quang Binh province (Source: VNA) 
The cave was discovered by Ho Khanh, a local farmer in 1991 (Source: VNA) 
It was first explored in 2009 by the British Cave Research Association and has been open to the public since 2013 (Source: VNA) 
It was first explored in 2009 by the British Cave Research Association and has been open to the public since 2013 (Source: VNA) 
The 1,645m-long cave system, which extends through a mountain, was named one of the most captivating caves on earth by National Geographic (Source: VNA) 
The 1,645m-long cave system, which extends through a mountain, was named one of the most captivating caves on earth by National Geographic (Source: VNA) 
The 1,645m-long cave system, which extends through a mountain, was named one of the most captivating caves on earth by National Geographic (Source: VNA) 
Geologists say the cave formed two to five million years ago (Source: VNA) 
Geologists say the cave formed two to five million years ago (Source: VNA) 
The cave is roughly 6,5km long, 200m high and 150m wide (Source: VNA) 
It contains some of the tallest known stalagmites in the world, which are up to 70m tall (Source: VNA) 
The cave has been listed as one of five dream destinations for 2019 by travel magazine Lonely Planet (Source: VNA) 
The cave has been listed as one of five dream destinations for 2019 by travel magazine Lonely Planet (Source: VNA) 
The cave has been listed as one of five dream destinations for 2019 by travel magazine Lonely Planet (Source: VNA) VNA
