Rome is a city where time is simultaneous.

01 The city that doesn't rope off the past

Most historic cities keep their history in a designated zone — the old town, the archaeological park, the museum — where you go to look at the past and then return to the present. Rome refuses the separation. Step out of a metro and you trip over a Republican temple; the café behind it occupies a Renaissance palazzo; the wall it leans on is imperial brick. There is no 'historic centre' because there is no part that isn't historic.

Understand that one thing and Rome stops being an exhausting checklist of monuments and becomes something stranger and easier: a place where you don't visit the past, you just walk around in it.

02 Not layers, but everything at once

Dig anywhere in Rome and you find time stacked. The basilica of San Clemente is the textbook case: a 12th-century church sits on a 4th-century church, which sits on a 1st-century Roman house and a temple of Mithras, which sits on foundations from the Republic — four levels you can physically descend, the centuries getting damper as you go.

But 'layers' is almost the wrong word, because it suggests the past is buried and finished. In Rome it isn't. The 12th-century church on top is still a working parish; Mass is said above the Mithraic temple. The eras aren't stacked like dead strata. They're all switched on at once.

03 A city built out of itself

Rome's other trick is that it built itself out of its own ruins. For centuries the city was a quarry: columns, marble and stone were lifted from imperial buildings and re-set into churches and palaces — what architects call spolia. Walk into almost any old Roman church and the columns dividing the nave are older than Christianity, scavenged from some temple or bath.

The Pantheon is the supreme example: a pagan temple to all the gods, nearly two thousand years old and still roofed by its original dome, that survived precisely because it was turned into a church. The obelisk in Piazza del Popolo is Egyptian, hauled to Rome by emperors and re-erected by popes. Nothing here is thrown away; it is simply assigned a new job. The city is a collage of its own past, endlessly re-used.

04 The Roman shrug

What you notice next is the Romans' attitude to all this, which is: none. The awe is entirely the visitor's. A Roman parks a scooter against a 1,900-year-old wall, hangs the washing across a medieval lane, drinks a coffee with the Forum in the background and never looks up. The ruins of Largo Argentina, where Julius Caesar was assassinated, are now most famous as a cat sanctuary.

This isn't disrespect; it's familiarity. When the extraordinary is your everyday backdrop, you stop performing reverence for it. The Roman relationship with the past is domestic, not devotional — the way you stop seeing the photographs on your own hallway wall.

05 Why the awe is yours, not theirs

Here is the discovery that reframes the whole trip. The visitor arrives braced to be overwhelmed by History with a capital H, and spends the first day craning at everything. Then, slowly, the city teaches you its own register: the casual one. You start drinking your coffee with your back to the monument, letting the past be furniture rather than spectacle.

That is the gift Rome actually gives — not the sights themselves, which you could see in any guidebook, but the experience of living, briefly, in a place where three thousand years are simply the air. The Romans aren't unimpressed because they're jaded. They're unimpressed because, to them, it's just home.

06 What stays

Leave Rome and the individual monuments blur — you will confuse one triumphal arch with another within a month. What stays is the sensation of simultaneity: that disorienting, wonderful moment when you realised the bus stop, the bakery and the ancient temple were all simply Tuesday.

That is Rome's real difference. Not that it has more history than anywhere else, but that it refuses to keep it in the past. The city asks only that you stop treating its antiquity as a museum and start treating it, as the Romans do, as the place you happen to be standing.