The arcade that connects Porta Saragozza to the Sanctuary of San Luca is the longest in the world. Within its 3.5 kilometers there are 666 arches, each marked by a number: the first 306 connect Porta Saragozza to Meloncello Arch, while the last 360 are located in the hilly area from Meloncello to Colle della Guardia. These are spaced out by 15 chapels illustrating the mystery of the rosary. The tour starts from Piazza Maggiore with a little train ride to Sanctuary of the Madonna di San Luca. Begin the guided tour with the Sanctuary of San Luca and its panoramic forecourt with an optional visit to the Dome of the Sanctuary to admire the panorama of the city. Enjoy the descent with a little train ride along the arcade that leads to Meloncello's Arch and then along via Saragozza. Passing through Porta Saragozza, arrive at the Collegio di Spagna and de'Carbonesi, continuing via Massimo d'Azeglio you’ll return to Piazza Maggiore.