Two countries. One day.
Well, technically. One country, one "city-state": Vatican City, which is independent from Italy so I say it counts. In any case, as is with everything in Rome, the size of the monuments in Vatican City are large enough for an entire country.
I'd like to start this part of the post with a little word to the wise, as I know we all have hopes of visiting Rome, and when that occurs Vatican City is obviously a stop on the tourist loop. There are two entrances: one that leads you to the Sistine Chapel & the Vatican Museum and the other, which takes you straight into Saint Peters Basilica. So be sure and know which one you want first. I state this, mostly because I was unaware of this fact, and the girls and I spent the initial part of our morning walking back and forth trying to figure out what to do, whilst, as is the norm, being harassed by various guides and merchants trying to bamboozle us.
On the upside though, we got some picture ops early in the morning when the crowds weren't too outrageous.