There’s a moment near the beginning of William Wyler’s Roman Holiday (1953) when, after a lavish ceremony at the ambassador’s residence in Rome, young Princess Ann (Audrey Hepburn) decides to escape from her royal duties and hides in the back of a delivery truck as it heads off into the heart of the Eternal City.

Squashed between jostling crates of Cinzano and San Pellegrino, she peeks out of the back and takes in the bustling nightlife. Streets lined with cafés, couples riding Vespas – it’s the classic image of Rome in the 1950s and 60s; the time when streams of Hollywood productions decamped to Cinecittà, the legendary film studios opened by Mussolini in 1937.