Tico's Mysterious Rock Formations...
Bump -- in the United States but "not especially" the Southwest.
Is this east of the Rockies? <n'mind, I see you've told us it is the Garden of the Gods>
We came by our answer honestly, Tico. Your hint didn't help because Francis found a different picture where it was called "Cathedral Spires".

I am in the midst of planning a family reunion at Custer State Park and have South Dakota on my mind, I guess. God help me-- EEyikes.)
Here's the Mysterious Photo which is pages (and pages) back:
Francis agreed with me.
Francis wrote:I think so...
Cathedral Spires :

My pic of the rock formations near Sylvan Lake: