So for a trip down Memory Lane....
Here are two from a Sierra Club hike through Baylor Pass in the Organ Mountains east of Las Cruces, NM. Since it was 1999, I used a Kodak disposable film camera, and had the pictures put on a 3-inch floppy. Thank heavens my computer can still read it!
Here's a rock that looks deliberately placed on top of a tall boulder.
Now it is 2003, and I am proudly using a recently-affordable digital camera. Walking along a trail, I see this strange pile of rocks and snap a quick shot.
Now it is 2005, and I have included this strangely balanced boulder in my overview of Canyonlands National Park.
Now for a change of scenery, here are some glacial erratics on bedrock, photographed in 2008.
There are stone structure all over the southwest, and in California. The one area I visited and didn't photograph any stone structures was Washington State. There was not a single structure in hundreds of photos from Olympic National Park and nearby areas. The Indians there were very adept at carving wood into fine boxes and implements, so maybe carved wood was used instead of stone. However, I did see this familiar sight at the Makah reservation, while visiting Cape Flattery.