Ferrara is the city that engineered itself, and this self-guided walking tour traces how. In 1385 the Este dukes raised a moated fortress against their own citizens; a century later they clad a palace in 8,500 stone diamonds and laid out Europe's first master-planned Renaissance street grid, a short walk from the shadowed medieval arcades of Via delle Volte. Everything runs from your phone, with no app to install. Ten stops are mapped for you, with walking directions between them and a short audio storey at each one, followed by an interactive quiz that turns the details into something you actually remember. The route runs north to south, from Corso Ercole I d'Este and the Quadrivio degli Angeli past the Castello Estense to the cathedral squares, the old Jewish ghetto and Via delle Volte. Start whenever you like, pause for a coffee, take a detour. There is no group, no schedule and no guide waiting on you. Audio and text are available in seven languages.