All along the upper portions of the walls at St. Paul’s Basilica are portraits to recognize every single pope. Here we see that last four and an empty slot for the next one.
(Sorry it’s a bit blurred the lighting was terrible. I had to shoot handheld at 1/5 sec with a 35mm lens.)
These tall evergreens, trimmed so they have only wide flat greenery at the top, are all over Rome. They date back to the days of the Roman empire. They were pruned this way to provide shade for the Roman soldiers as they marched around the city.