dle Ages, which circled a 7.5 km (4.7 mi) part of the city) with the Sanctuary of the Madonna di San Luca, a church begun in 1723 on the site of an 11th-century edifice which had already been enlarged in the 14th century, prominently located on a hill (289 metres (948 feet)) overlooking the tow

the city's historical centre[13] (over 45 km (28 mi) in the city proper), which make it possible to walk for long distances sheltered from the elements.
The Portico di San Luca is possibly the world's longest.[14] It connects Porta Saragozza (one of the twelve gates of the ancient walls built in the Middle Ages, which circled a 7.5 km (4.7 mi) part of the city) with the Sanctuary of the Madonna di San Luca, a church begun in 1723 on the site of an 11th-century edifice which had already been enlarged in the 14th century, prominently located on a hill (289 metres (948 feet)) overlooking the town, which is one of Bologna's main landmarks. The winding 666 vault arcade, almost four kilometres (3,796 m) long, effectively links San Luca, as the church is commonly called, to the centre of town. Its porticos provide shelter for the traditional procession which every year since 1433 has carried a Byzantine icon of the Madonna with Child attributed to Luke the Evangelist down to the cathedral during Ascension week.[13]
Other churches in Bologna include:
San Petronio Basilica, one of the world's largest
Bologna Cathedral
St. Stephen basilica and sanctuary
St. Dominic basilica and sanctuary
St. Francis basilica
Santa Maria dei Servi basilica
San Giacomo Maggiore basilica (13th–14th century), featuring numerous Renaissance artworks such as Lorenzo Costa the Elder's Bentivoglio Altarpiece
San Michele in Bosco
Economy[edit]



Unipol Tower, at 127 m, is the city's tallest building.
Bologna is an important railway and motorway hub in Italy. The economy of Bologna is characterized by a flourishing industrial sector, traditionally based on the transformation of agricultural and zootechnical products (Granarolo, Segafredo Zanetti). It also includes machinery (Coesia), automobiles, footwear, textile, engineering, chemical, printing and publishing industries, as well as a strong financial, insurance (Unipol) and retail (Coop Italia, Conad) activity. The city's Fiera District (exhibition centre) is one of the largest in Europe, with important yearly international expos focused on the automobile sector (Bologna Motor Show), ceramics for the building industry (International Exhibition of Ceramic Tiles and Bathroom Furnishings) and food industry. In addition, several important firms in the fields of automobiles (Lamborghini), motorcycles (Ducati), mechanics, food, tobacco and electronics have their headquarters in the urban area of Bologna, as well as important retail and wholesale trade (the "Centergross" in Argelato, esabilished in 1973), and one of the largest Italian food processing companies (Conserve Italia).