This is Sunset Crater, near Flagstaff, Arizona. Do you see the two lines on the side of the crater that go up toward the top? Those are old trails. You used to be able to walk to the top of the crater. But the people walking on the trails was causing erosion, so they closed them. Even after decades of people not using the trails, you can still see them. It will be a long time before all traces of the damage is gone.
This is image # SUNSETC0220
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