One day, a Vietnamese farmer decided to take a walk in the mountains and suddenly he discovered this small cave. But it was not just a cave, but an entire city.
It had its own fauna and its own nature. It looked like a 40 story skyscraper.
Today, this cave is part of Phon Nha-Ke Bang National Park near Hanoi Province.
This cave has not been discovered for a long time. It was discovered in 1991. According to scientists, the age of the cave is 2-5 million years.
Talking about the inner world of the cave, we can say that it has its own rivers, lakes and even beaches! It is about 87 miles long.
Today, hikes and excursions are collected in the cave. For example, a 7-day tour costs $2,300.