Here's the original photo, rotated like in the video.
And this is another photo of that area.
And, as we have a stereo pair, we can have an attempt at 3D.
Unfortunately, the differences between the two photos (they appear to have been taken on different seasons) make it hard to get a better understanding of how things look in 3D.
Interesting, but it doesn't look like a wall to me, it looks too much like the rest of the ground.
Edit: I forgot the link to the photo's page.
PSP_009760_2650