They have multiple entrances and can be a unique base spot. Its home of the Megalosaurus and some other cave dinos. But you should know that the spawnrate is very low, they're just to make you frightened when you find one. Also the fog is intended to be real strong and even the darkness. At some places are overlights which allow Plants to grow there.
This cave has even two water entrances which can be accessed from the Watertunnel with at least a Plesiosaur.
- Megalosaurus (rare)
|Castle||21.1||40.4||dark and long dive|
|Water I||long dive|
|Water II||long dive|
- some rock pillars are able to hold a treeplatform (those rocks have rope around seen in the last pic above)