A 'keyhole' on Rome's Aventine hill contains a glorious surprise.

On the summit of Rome's Aventine hill, near the Giardino degli Aranci or Orange Garden, lies the Church of S. Maria del Priorato.

The church is owned by the Knights of Malta, an ancient religious military order, whose property enjoys extraterritorial status.

Peering through the peephole of the unassuming door provides a magical view of the dome of St Peter's, framed by trees, allowing the viewer to see across three countries: the sovereign territory owned by the knights, then Italy, and in the distance the Vatican.

One of the most magical times to peep through the keyhole is just after sunrise.