A couple of months ago, I posted something from the car park at Sutro Baths, the now-derelict swimming pool complex on the Pacific coast in San Francisco. I think these are the stumps of the wall that faced the ocean, slowly rusting away. Taking these shots rather bemused a passer-by who thought I must have been photographing some small animal or something.
There are two versions: different sections of the same wall. Now that I come to post them, I see that #1 is a little over-sharpened, which I'll fix when I get the chance.