Portico di San Luca (Portico of San Luca), Bologna (must see)

A defining characteristic of Bologna is its extensive network of "portici", or porticoes, stretching for nearly 40 kilometers (25 miles). Originally constructed from wood outside the homes of shopkeepers to provide additional space for trade, these elegant arcades date back centuries. In 1568, primarily due to concerns over fire hazards, regulations mandated that porticoes be constructed from brick or stone, though a handful of the original wooden structures still remain.

Among these structures, the Portico San Luca stands out as the world's longest, stretching for almost 3.5 kilometers (2 miles) up to the hilltop Sanctuary of San Luca. Its existence is owed to the dedication of Don Ludovico Genaroli, who spent two decades championing its construction. The portico serves to shield pilgrims making their vows to the Madonna of Saint Luke from inclement weather and harsh sunlight, while also facilitating the annual procession that transports the revered image from the Sanctuary to Saint Peter's Cathedral in the city center for a week of festivities before returning it to its hillside abode overlooking Bologna.

Funded by devout believers, artisan guilds, and prominent Bolognese families, this monumental undertaking was realized under the guidance of the Bolognese architect Carlo Francesco Dotti (1670-1759). Dotti was not only responsible for completing the portico project but also for designing the new basilica constructed to accompany it, as well as the Meloncello Arch ("Arco del Meloncello"), marking the starting point of the ascent to the Colle della Guardia.