It's fascinating also because it seems to have been at the heart of an extensive road network with sophisticated trade routes.
Adding to the mystery is that (at least when we visited) there are no motels outside the park, no tourist traps at all.
Yes, this is what I mean by the sight lines that were pointed out to us.
This was way back in the early '90s, I think. It was a rough road driving in there and the only person we saw was a Navajo woman herding her sheep. She was a little consternated by our caravan and needed to be reassured.
An excellent park ranger took us walking out to some caves to see rock art. I loved the feeling of being there; something special in the air.