The world's largest cave wasn't discovered until 1991!

 

The Son Doong Cave in Vietnam is by far, the largest cave in the world. The cave is over 5.5 miles long, is home to a jungle, river, and could easily fit a 40-story skyscraper within it! Incredibly, the cave wasn't discovered until 1991. However, the man was frightened by the massive drop at the entrance of the cave, so he didn't further explore it.

It wasn't until 2009 that a team of British Cavers decided to explore it. Now, in 2014, a tour company called Oxalis is running trial tours of the cave! The drop that the man was afraid of at the entrance of the cave is being turned into an 80 meter rappel experience for tourists to enter the cave!

Visitors of the cave have seen some of the most beautiful sights that Vietnam has to offer. The fact that the cave remained undiscovered for so long only makes the tour of the cave that much more magical. The roof of the cave collapsed centuries ago, which allowed outside life to grow in the cave! It wasn't long before the jungle started to form what is now known as the Garden of Edam!

Source: http://www.omg-facts.com/#MtOcS8vrMAQtvBrE.99