The oculus
A nine-metre opening to the sky, unglazed for two thousand years — the only light source, and proof the Romans built for eternity.
Camille Gévaudan — CC BY-SA 3.0 · Dietmar Rabich — CC BY-SA 4.0 · Maksim Sokolov (maxergon.com) — CC BY-SA 4.0 · Jebulon for the photograph. Architect of the church: Soufflot . Sculptor of the relief: David d'Angers — Public domain
Yes, since 2023, a nominal fee after centuries of free access, with under-18s exempt. Booking ahead is optional but saves the queue in season.
Rain really does fall through the oculus, becoming a column of water in the middle of the hall — and the floor's original Roman drains swallow it. A rare sight worth deliberately visiting on a wet day.
Half an hour inside is enough; add another for the square and its cafés — it's the ideal opening or closing stop on any central Rome walk.
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The most complete Roman building we have, and the world's largest unreinforced concrete dome still standing: the Pantheon. Built by Hadrian around AD 126 over an earlier temple, it has been in continuous use for nineteen centuries — which is precisely why it survived: converted to a church in 609, it escaped the quarrying that consumed Rome's other temples. The interior does what no photograph manages: a dome 43 metres across and exactly 43 metres high — complete the sphere and it would touch the floor — crowned by the oculus, a nine-metre opening onto open sky. There is no glass: rain really does fall inside, and the marble floor is subtly canted with drains designed for it two thousand years ago. A shaft of sunlight tracks across the walls all day like a giant clock. Raphael is buried here, as are Italy's first two kings. Entry has carried a small fee since 2023 after centuries of being free, and booking online saves the queue in season — it remains among the cheapest and most profound things you will see in Rome.
A nine-metre opening to the sky, unglazed for two thousand years — the only light source, and proof the Romans built for eternity.
The Renaissance master lies here by his own wish, under a Latin couplet saying Nature feared he would outdo her while he lived.
The concrete lightens as it rises (volcanic pumice at the top) and coffers cut the weight — an engineering lesson two millennia ahead of its time.
Cafés and an obelisk fountain face the portico — sit afterwards and study the granite columns, quarried in Egypt.
Piazza della Rotonda, Rome
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