On the first night we were in Rome I took Amy to a couple of places that are cool to see at night: The Trevi fountain, Pantheon and the Spanish steps. We had dinner in a local osteria.
Trevi Fountain at night
The next day we started out early because we had a lot to see. We began at the Colosseum, which is pretty awesome no matter how many times you have seen it. Amy got a guided tour from a rented microphone which was very helpful.
I had to come here to see this because of the scene from Roman Holiday! Amy had not see it until the night before we left for Roma and loved it too! Its not exactly exciting but cool to be in a place they filmed such a good movie.