@Frank Apisa,
Yeah, I'm not as adamant on that as I used to be, but the urbanist pov was that Bernini, the piazza designer, didn't have an interest in there being a clear view to the dome.. walking through the the borgo and then through the massive columns brought you to a glorious surprise once you got into the piazza, whammo! There was another whole segment planned by him to complete the colonnade.. that never got built.
Some of that surprise is still there - if you enter the piazza having come from the Ottaviano train stop and not the via.
Diane and I both cried big hulking crocodile tears over the recent small movie, Tosca - about elderly opera singers still singing it. Oh, man...
My bucket list is all in my mind and heart. One of the places I'd like to spend a month or more is Sicily.