"I can stand back, look at a scene, look at a panorama, and go "WOW! Someone might consider this sacred and I think I can see why! but I'll just enjoy it for what I perceive it to be - bloody lovely

I think in some ways that is the crux of it. That sense of "Bloody Lovely" as FW's put's it IS possibly the same thing that endows others with a sense of the 'sacred' in response to such a sight or place and perhaps provides the impetus to define an area so spectacular as "sacred", especially in the context of more ancient times. It's down to point of view and language amongst other, broader issues.
But at the heart of it I would suggest there is an emotional resonance that provides the kernal of the glorious internal zap that engenders a place with its essential "bloody Lovlinessess" and/or depending on what you bring to the party, sacredness.