An anon posted this in last bread and I couldn't help but notice that

St. Peter's Square is shaped like a key hole and that got me to thinking.

I had a memory of the basilica being built on top of something older, but couldn't remember what. After a quick wiki search (It does have its uses), I was reminded that it is purportedly built on top of St Peter's tomb, which I take to be made of stone.

We should all know the three city states, each with their own Egyptian obelisk, which controls everything. Could Q be telling us that the Vatican is the key?