While in Rome, odds are you will visit the Colosseum and included with the ticket are free entries into the Roman Forum and Palantine Hill both are nearby and worth a visit if you have some time. While in my mind, they aren't as interesting as the Colosseum, they are still interesting to see.
There are many structures that remain standing and a lot to take in due to how different things are. It won't take long to walk through it but it is interesting to see due to how they were able to make all of these structures in the 700-800 BC era.
Past Point of Interest will return in June!