I'm continually amazed that these sites still exist and haven't been bulldozed for the sake of a slightly wider roads and more growing space.  They don't seem significant enough to be granted protection under historic registers and likely only attract the attention of wayward photographers. Regardless of what keeps them around, I love these places and always have a mental queue of more to visit. I'm hoping to stop by the museum when it is open this spring and get some factual information too.