Colosseum
One should, if possible, also visit the Colosseum by night. With the nice illumination it is even more impressive then during the daytime.

Colosseum

Colosseum
Some people day that the inside of the Colosseum is not interesting. I absolutely disagree! We took a guided tour, it was not more expensive then the normal entrance fee and we got to pass the waiting line.

Colosseum

Forum The "Forum" is a large area of roman ruins. It helps to imagine how it used to look, if you have already visited other site like e.g. Pompeii.
Santa Maria Sopra Minerva The "Santa Maria Sopra Minerva" is, like all other churches in Rome, completely covered in marble. Unfortunately this marble was taken from roman temples and palaces, which now can't show their original splendor.
Santa Maria Maggiore the main altar of "Santa Maria Maggiore". Pretty, but only if one doesn't think about what else one could have done with all this gold and splendor -- maybe help poor people? -- no, rather build another pretty church.
Duff-Bier Duff-Bier (known from the Simpsons) seams to really exist now, at least in Italy.