“If you ever do visit the actual St. Peter’s, make sure you take the elevator (!) to the walkway along the bottom edge of the great dome, and then once you’ve been sufficiently awe-struck by peering over and down at the hordes moving purposefully below, take a deep breath (and a lot more) and head up to the outdoor viewing area at the very top.
Even the stairs are worth the effort, since you’re left wondering how they ever managed to build such curving, twisty things. You literally lean right over against the dome itself as you ascend.”