Have you heard of acrophobia? I think it is something to do with a fear?
Oh yes, it is the fear of height
I see, I definitely have that fear at times. I don't like to go up tall buildings because I get dizzy.
Me too, its so scary. Most people experience a degree of natural fear when exposed to heights, 
That probably came from our evolutionary history. I bet many who weren't afraid of heights fell of a cliff, lol.
Oh yes, those who have such of such exposure are said to have a head for heights.
I think skydivers and BASE jumpers definitely have a head for heights. You won't catch me dead doing those activities, lol!
I'm telling you, A head for heights is advantageous for those hiking