This is in Poway, CA. I used to live in this burg. Virtually all the land in this area has these huge rocks like you see here. There are thousands of them, some as big as houses. They didn't grow there, they were pushed... by a glacier. When the glacier melted they were left behind.
This is less than 30 miles from the Mexican border.
This looks like Texas Canyon, located in Cochise County, AZ. It is also less than 30 miles from the Mexican border.