Thanks Erika, me, I'm the opposite. Growing up I used to explore limestone caves in Iowa. I also have no fear whatsoever of heights... drove my poor mother crazy... LOL
I did the caves too, and rock-climbing and going up on vertical ladders etc. - as a kid. I had no fear. But years later, when I went back to those same places, my knees were shaking of fear lol. I was really puzzled by it.