Rome's most famous "peephole"

The Aventine keyhole (buco della serratura) is one of Rome's most celebrated and beloved secrets. In Piazza dei Cavalieri di Malta, on the green door of the Villa del Priorato di Malta (home of the Knights of Malta), there is a keyhole that hides an extraordinary surprise: peer through it and the dome of St Peter's appears in the distance, perfectly framed by a long hedge of laurel. Three states in a single glance (Italy, the Order of Malta and the Vatican), in a piece of stagecraft that leaves everyone speechless.

It's free, it lasts a moment, but it's an experience you won't forget — and one of the most sought-after photos in Rome.

Why it's so special

The effect is no accident: the hedge lining the garden path was deliberately arranged to "frame" the dome of St Peter's at the far end, creating a flawless perspective. The square and its staging were designed in the 18th century by the engraver and architect Giovanni Battista Piranesi, in an elegant, symbolic style. The result is one of the city's most successful "perspective tricks."

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How to find it

The keyhole is in Piazza dei Cavalieri di Malta, on the Aventine, a few minutes' walk from the Giardino degli Aranci (Orange Garden). Look for the large green door of the Villa del Priorato di Malta: the keyhole is the central one, at eye level. There's often a small line of curious visitors waiting their turn to peek — a little patience and your moment will come too.

Practical tips

  • Free and quick: just step up to the keyhole and look — it's free.
  • Skip the rush hours: midday can mean a line; early morning or late afternoon is better.
  • For the photo: shooting through the keyhole is tricky (you need to rest the lens just right); bring some patience.
  • Pair it with the Giardino degli Aranci: it's a few steps away, perfect for sunset.
  • Respect the place: it's the seat of an Order, so keep a discreet manner.

Frequently asked questions

What is the Aventine keyhole? It's the keyhole in the door of the Villa del Priorato di Malta, in Piazza dei Cavalieri di Malta, through which you see the dome of St Peter's perfectly framed by a hedge: one of Rome's most famous secrets.

Why does St Peter's appear framed? Because the garden hedge was arranged on purpose to "frame" the dome of St Peter's at the end of the path, creating a flawless perspective. The staging was designed by Piranesi in the 18th century.

How much does it cost? Nothing: stepping up to the keyhole is free. There can be a bit of a line during rush hours.

Can you go inside the villa? No, the villa is the seat of the Knights of Malta and is not open to general visits. The experience is looking through the keyhole in the door.

When's the best time to go? Early morning or late afternoon, to avoid the line. It pairs perfectly with the Giardino degli Aranci, just steps away, especially at sunset.

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Article #391 · Category: Neighborhoods · Updated: May 2026