Rock Arts

I saw native american rock arts at Valley of Fire State Park first time. I was really impressed. Certainly it is hard to identify how many years ago that was drawn, but no doubt that was at least hundreds years ago. Such a old and precious rock arts can be seen everywhere. If that was found in Japan, the part of rock with rock arts would be covered by glass case or the rock would be cut and moved to the museum. Here I can see the sign saying vandalism should be reported. That's it?

I borrow rock arts book at the henderson library. I know there are so many rock arts in this country. It's historical and should be preserved, but it's not so rare. That's why rock arts is kept as it is. I know there is the place where I can see many rock arts near Laughlin. I want to go there somewhere!