Not an answerable question: what did you have in mind?
Caves are individual but are not exactly "phenomena". Too many of them for that.
I'll explore this cavern when I have a flashlight.
Space Cavern was created in 1980.
Space Cavern happened in 2600.
Cavern of the Fear was created in 2002.
The Cavern Club was created in 1957.
Cavern Creatures was created in 1983.
Cavern Creatures happened in 1983.
There is no such thing as monkey cavern. I wish there was though. :( this is the most frickin, hilarious question..... monkey cavern!!!!!!!!!!!!!!
The Child of the Cavern was created in 1877-04.
The duration of The Cavern - film - is 1.33 hours.
I'm not going any further into this cavern without a longer roll of twine! This cavern is cold and damp.
Magma Cavern Pit is 23 floors Then there is a Magma Cavern Pit Magma Cavern Pit has 3 floors and the 3rd floor is Groudon