I'd call it: Fantasy Canyon II

outside Dinosaur National Monument

Fantasy Canyon is small ... more like an acre of ten-foot sand-sculpture left behind by a bunch of kids. (Though rattle snakes love to hang in the endless cubby-holes.) 

And the ride to get there was apocalyptic--a journey through oil fields and amazingly barren range land.  We saw sheep herders, sheep and enough roadkill to outfit a small ranch.  Dead cows?  Dead horses?  Really?  In Utah?  The whole thing was an exercise in suspending belief!