A slightly, but only slightly, exaggerated view of the smog at the Great Wall of China the day we were there. (It’s effect on the view was accentuated due to the long distance view through a telephoto lens and then I darkened the edges of the image for more drama.) Note the wall crawling up the spine of the front line of mountains to the watchtower at the top. Apparently the wall was great protection from invasion back before the days of gunpowder anyway, but it’s certainly offers zero protection from smog. A smog wall (as opposed to a wall of smog); now that’s something I could stand behind!