I thought of a pipeline, too, but it looks as if there's a guard rail of some sort across the opening, which is why I went with a well. It almost looks like cobblestones--or, I agree, at least stones--very strange! :-)))
Probably a vertical well with the sun shining on the water at the bottom....or......a horizontal tunnel.....don't know what it is for in that case. Nice stone work.
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