I was stationed on Treasure Island for 10 days in July of 1969, while I was getting discharged from the Marine Corps. I was fascinated and mystified by the remains of streets and buildings laid out neatly over a large area, the only evidence being little stones in the ground marking off the blocks.
It was only many years later that I learned what it was all about. How I wish I had had a complete guidebook and map, to be able to visualize what had stood there! I'm told that even those little evidences are now long gone. :-(

...let me belatedly complement whoever took this picture on its excellent composition.

Must be Kodachrome in its infancy!

[Actually the second version of the film, introduced in 1938. The original 1935 Kodachrome's color dyes were not as stable. -tterrace]