Answer:
Salty water everywhere but not sea in sight.
A great mysterious place that the bold have been known to journey into.
The higher I climb, the hotter I engage. I cannot escape from my crystal cage.
What goes around and around the wood, but never goes into the wood?
You saw me where I never was and where I could not be. And yet within that very place, my face you often see.
I never sleep yet sometimes I weep. I can get angry or just be happy. Wherever you go, I will follow. No matter what you do, I will be there. I cannot die. What am I?