A bit north of the Arrowhead Arch are tall and very steep cliffs, the Messmore cliffs. Above is a look from the top.
And this is how they look from below.
To get there (unless you have a rope and know how to rappel), follow the derelict forest road on the cliff top east until you hit the no trespassing chain, then descend left and follow the cliffs.
There is lots to explore, in complete solitude.
Much of it is otherworldly
or retracts into abstraction.
This has been quite some experience.
The Inner Frame 
You’re right, complete solitude. We just returned from the cliffs, great experience.
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