This is an environment concept for the "Tiberium" project that also shows a vehicle. The entire foreground is 3D, which was rendered and blended into the background.
The background is based on some photos and unfortunately I can not recall where they originated. Sometimes, in order to save time, we would paste images together using whatever could be found in our reference collection. I almost never use photos in this way nowadays - however this image was made several years ago.