Okay, so, here are some things that would be cool to find naturally.
- Mountains that would be extremely difficult to scale but would have snow at the peaks and caves on the sides.
- Underwater caves to explore. (A quite hard thing to do.)
- Trees in more interesting shapes. (Obviously suggested before.)
...And that's what I have so far. Feel free to suggest more stuff in the comments. (And keep it real.)
- Mountains that would be extremely difficult to scale but would have snow at the peaks and caves on the sides.
- Underwater caves to explore. (A quite hard thing to do.)
- Trees in more interesting shapes. (Obviously suggested before.)
...And that's what I have so far. Feel free to suggest more stuff in the comments. (And keep it real.)
Just look for them. Underwater caves don't really show up in the way that I think you are asking, but they do show up in ways very similar to that.