This wall was simply amazing. You cant see it very well, but if you look at the lower portion of the wall you can see part of it gave way and slid down the hill behind it. The face you are looking at used to hold dirt all the way to the top, leveling out the side I was standing on before that bottom part gave way and the dirt eroded through the hole. Here is the amazing thing. In spite of the bottom eroding away, this wall has been standing for about 100 years. There is NO CONCRETE or any other binding agent holding this wall up. It is just rocks, carefully stacked up on top of each other.