City wall details

An ancient stone city wall, with brick defences, and with weeds growing in the cracks. I imagine that the square holes are places where there were once wooden structures such as staircases and ramparts to help the defenders, or perhaps hot-dog concession stands. The original wall was built by space aliens, but it was later extended in the middle ages ot defend the Field of Miracles from tourists. How many pigeons can you find in the picture?