A 2,000-year-old temple that is still, impossibly, standing — and still in use. The crowds are the only thing that hasn't aged well.
The Pantheon is older than the Colosseum and, unlike the Colosseum, it isn't in ruins — you walk in and stand on the same marble floor Roman emperors walked on, under a dome that is still the largest unreinforced concrete dome in the world. That's not marketing; that's genuinely staggering. The one real decision here is timing: get it right and it's a highlight of Rome, get it wrong and you're shuffling shoulder-to-shoulder through one of the most packed sites in the city.
Absolutely — it's one of the most important and best-preserved ancient structures in the world, and nothing else in Rome quite replicates the experience of standing under that dome. Go early or late and it earns every minute.
Entry is ticketed — it's no longer free to enter. Prices move, so check the official site before you go.
Arrive before 8 AM or after 6 PM to beat the worst of the crowds, and check whether buying on the day is faster than the pre-booked queue when you arrive.