Jebulon / CC0, via Wikimedia Commons The Pantheon
Two thousand years old, still the largest unreinforced concrete dome on Earth — and it's a 30-minute visit in the middle of everything.
Highlights
- Stand under the 43.3-metre concrete dome — unmatched for almost 2,000 years
- Watch the beam of light from the oculus track across the original marble floor
- Visit Raphael's tomb and the tombs of Italy's first kings
- One of the cheapest paid sights in Rome at €5 — and one of the best
Why the Pantheon matters
The Pantheon is the best-preserved building of ancient Rome, and it is not close. Completed under the emperor Hadrian around 126 AD (the facade inscription crediting Marcus Agrippa refers to the earlier temple that burned down), it has been in continuous use for nearly two millennia — since 609 AD as the church of Santa Maria ad Martyres, which is why it was never quarried for building material like the Colosseum.
The dome is the reason to come. At 43.3 metres in diameter it remains the largest unreinforced concrete dome ever built — wider than St Peter's, wider than the Duomo in Florence. The Roman engineers graded the concrete, using heavy travertine aggregate at the base and light volcanic pumice near the crown, and the coffered ceiling removes weight without weakening the structure. Nobody matched it until the 20th century.
What to look for inside
The oculus. The nine-metre-wide opening at the top of the dome is the building's only window. On a sunny morning it throws a spotlight that slowly crosses the interior; in rain, water falls through and drains through 22 discreet holes in the gently sloping floor — which is the original Roman marble, still doing its job.
Raphael's tomb. On the left side as you face the altar. The inscription by Pietro Bembo is one of the most famous epitaphs ever written: "Here lies Raphael, by whom nature feared to be outdone while he lived, and when he died, feared she too would die."
The royal tombs. Vittorio Emanuele II and Umberto I, the first two kings of unified Italy, flank the rotunda. Volunteer honour guards still attend them.
The doors. The massive bronze doors are ancient — among the very few original Roman bronze doors surviving anywhere, because bronze this size was usually melted down centuries ago.
Practical tips
- Go early or late. The piazza outside fills by mid-morning. First thing (opening is at 9am) or the last hour of the day is dramatically calmer.
- It's a church. Shoulders and knees covered; visits pause during mass, and Sunday hours are shorter.
- Combine it. Piazza Navona is 5 minutes west, the Trevi Fountain 10 minutes east, and some of Rome's best coffee (Sant'Eustachio, Tazza d'Oro) is within 200 metres of the door.
- Look at the floor drains. Seriously — stand in the centre and find the holes. It is the little engineering details that make the place.
The Pantheon: Common Questions
Not any more — the Pantheon introduced a €5 entry ticket in July 2023 after nearly 15 centuries of free entry. Under-18s enter free and there are reduced rates for 18–25s. Because it is a working church (the Basilica of Santa Maria ad Martyres), worshippers attending mass still enter free, and the building closes to tourist visits during services.
Around 30–45 minutes. It is a single vast space — there are no wings or galleries to work through — but the dome rewards standing still and simply looking up for a while. Combine it with Piazza Navona (5 minutes away) and the Trevi Fountain (10 minutes) for a natural centro storico walking route.
On weekdays outside peak season you can usually buy on the door. On weekends and through summer, pre-booking a timed slot on the official site avoids a queue that can reach 30–45 minutes. Sunday visiting hours are shorter because of mass.
The oculus — the circular opening at the crown of the dome — is the building's only source of natural light and was entirely intentional. It lightens the load of the concrete dome and connects the temple to the sky. It is open to the weather: rain falls into the building and drains through discreet holes in the sloping marble floor, which is original and nearly 2,000 years old.
The painter Raphael, whose tomb has been here since his death in 1520, plus the first two kings of unified Italy — Vittorio Emanuele II and Umberto I — and Queen Margherita of Savoy. Raphael's tomb, on the left as you face the altar, is the most visited.