To summarize on “KEYHOLE”:
Ok so we have two independent references pertaining to Vatican. City layout features noticed by NIKK...
and the one you found, Cboldt, from which “keyhole” allows views from Knights of Malta property - at least one of which is a garden feature looking like a keyhole from which one can view Vatican dome.
Plus we now have reference to satellite equipment known as “keyhole” per Early Bird.
If I scrambled who found what, please forgive me. Still way behind!
hoosiermama found the second keyhole that I posted. I have nothing to do with either find. I post to keep both in the information....BUT ALL ROADS LEAD TO ROME