8:30 AM = 30-minute line. 10 AM = 90-minute line. Book a timed ticket online to skip almost entirely.
The combined Colosseum + Roman Forum + Palatine Hill ticket (16€) is valid for 24 hours. Use the time wisely.
Night tours of the Colosseum (April–October) are magical — fewer crowds, dramatic lighting, access to areas closed during the day.