Diamond Head State Monument is in a crater on Oahu. You can go to the park website for details. There’s a trail to the top of the crater that’s less than a mile long but has about a million stairs. Great views.
Here’s a view of the Diamond Head crater from outside (at the zoo, actually)
The basin of the crater, it looks like some of the areas in southern california!
on of the military installations on the rim of the crater where the trail goes to.
that’s the parking lot for the trail on the bottom left.
such a pretty coastline!