#China, the gates of Paradise
 This is the highest cave, it was formed in 263, when suddenly a large piece of the mountain just fell off, creating a huge cavity. 999 steps lead to its foot: according to legend, passing through them, you can achieve enlightenment and get closer to God. Not everyone can do this, and in China, apparently, they do not like to disappoint tourists, so they made the world's longest funicular and the highest open Elevator. You can almost always see a cloud of fog over the cave, which makes it even more mysterious.