At the southern end of Via di Santa Sabina, this ornate cypress-shaded square takes its name from the Cavalieri di Malta (Knights of Malta), who have their Roman headquarters here, in the Priorato dei Cavalieri di Malta. Although it’s closed to the public, the priory offers one of Rome’s most charming views: look through the keyhole and you’ll see the dome of St Peter’s perfectly aligned at the end of a hedge-lined avenue.