OK, now I know where to go next week. Sunday we are flying to Rome. We haven’t set up any tours figuring went we get there. This is now at the top of my list. Wow!
You may want to book this right away. They only take a few people a day.
At the Vatican, be sure to take the little side jaunt to see the tombs of the popes.
I assume you've been warned about the gypsies. They look exactly like what you'd think gypsies look like. Do not engage them (or more correctly, let don't let them engage you) and keep track of your valuables when they're around. If you're waiting in the line for the Vatican Museum, you'll definitely see them. On the streets around the Colosseum, too. Once you're aware of them, though, they're kind of interesting to observe in an anthropological way. Watch for the fake baby under the blanket hiding the pickpocketing arm thing.
What else? The Spanish Steps I thought were kinda disappointing. If you happen by them, enjoy them, but don't make a special effort to get there. My opinion, anyway.
On the other hand, don't hesitate to walk into any church if the doors are unlocked. They're all filled with treasures. We wandered into one, off the Piazza del Popolo, and saw two spectacular Caravaggio paintings, including this one, The Crucifixion of St. Peter
Are you going anywhere else in Italy?