The Madonna di San Luca sits on the wooded hill of Colle della Guardia, 280 metres above the southwest edge of the city. The Byzantine-style icon inside, said to have been painted by Saint Luke himself, has been the city's protector since the twelfth century. Every year at Ascension the icon is carried in procession down the portico into Bologna, where it stays in the cathedral for a week before being returned.
The walk up the portico from Porta Saragozza takes about an hour and is mostly uphill — bring water in summer. Alternatively, the San Luca Express tourist train runs from Piazza Maggiore on weekends. The terrace in front of the basilica gives the best view of Bologna and the plain of the Po.