Wall, steps and "bridge" on Mars

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wall, steps and bridge on MarsX3D

Visible in this shot from Curiosity Sol 690 is an arrow-straight wall with an arch (foot bridge?) on the right end.

On the left as the wall ascends the hill, you can see a constructed corner wall jutting out.

In front of that construction and descending at an angle to the right are regularly-spaced steps. 

There is more, of course, in this photo if you care to spend time examining it.