Before you head inside, there are a few things worth knowing. First off, Colosseum entry requirements aren't too over-the-top, but you will need to show a valid ID with your ticket—they do check. Don’t bring anything too big either. Colosseum bag restrictions mean large backpacks or rolling suitcases won’t get through, so it’s better to travel light.
Now, about the Colosseum last entry—don’t push it too close to closing time. They usually stop letting people in around an hour before they shut the gates. Better to show up with time to explore without feeling rushed.
Some parts of the site aren’t open to everyone unless you’ve booked a Colosseum restricted areas tour—like the arena floor and underground bits. Worth doing if you want the full experience.
Oh, and if you're around on the Colosseum free entry Sunday, expect more visitors, so getting in early is smart. Stick to the paths, and just enjoy the vibe.