Great job finding this structure (back of a billboard?), it is very powerful and looming looking. Not a big fan of the first two, a little too busy for me. But the last two are really great. You capture how big the structure was in the third, and the sunlight really highlights all of the small details of the wood going all the way up. Nice job.
Thats actually concrete. Forgot to mention it, because it does look like wood. I guess they didnt polish it in the process of making, hence the texture. Its a part of an outside wall of a local supermarket, old grey block building. Ill keep in mind what you said about the first 2.