Taken in the 1970's, when I lived in Southern California. I was riding my bike north of Claremont in the foothills, when I saw this stone "house". (I think that the building housed water pump machinery for the citrus groves located a few feet away.)

Taken with a Stereo Realist. This image was one of the sides of the stereo pair; printed using an enlarger. The print was later scanned.

Processed with GIMP.

A bit more on this type of architecture: The foothills below Mt. San Antonio (Old Baldy) were mostly orange groves then, but I expect that it is all filled in by houses these days. Naturally, the area below that high mountain receives huge numbers and sizes of boulders as they wash down during the rains. Farmers realized that these stones could be cemented together to make the wall of a house. There are many "antique" houses in the Claremont and Upland area with this style of walls.