I agree with Serethil. I frequently ride the horse along the ridge of a mountain just to look.
But my favorite places are two:
The little patches of sunlight in caves that has a little forest eco-system growing.
And the hidden waterfall valleys where you are surrounded by mountains on 2 or 3 side and everything is green and tree-ey and there is a waterfall. I think to myself "Here. Here is where I would build my cabin."
Yup. I WANT to build my own place, but I'm not good with stuff like the CK.... for right now, I have a player-house mod that's nice.... but I have one of those valleys marked with the blue marker on a map, and then saved as a graphic.... for if I ever can figure out the CK. (Yes, I know there are tutorials, but videos aren't a good thing for me, I need written stuff, and the written ones on the wiki don't tell me what I need to know.... *sigh*)