Photo credit: Carsten Peter | National Geographic
Yes, you've probably seen, or at least heard of Son Doong Cave, currently the world's largest, but now it's open to the public. It boasts "caverns capable of fitting entire city streets and skyscrapers [and] is home to a river, jungles, and entire cave ecosystems." Continue reading for a video, more pictures, and additional information.
In early August 2013, the first tourist group explored this cave in a guided tour, costing $3000 each. The group had six members from USA, Russia, Australia and Norway and spent 7 days and 6 nights for the tour. Next exploration trips will be arranged.