Basilica di Sant'Ambrogio

If the Duomo is Milan's showpiece, Sant'Ambrogio is its soul. The basilica was founded in the late fourth century by Ambrose, the bishop who became the city's patron saint and who baptised Augustine, and it has been rebuilt and extended ever since; the building you see today is mostly the Romanesque church of the eleventh and twelfth centuries, a model for churches across Lombardy. You arrive through a long arcaded atrium, a quiet brick courtyard that frames the facade with its two levels of arches and the two unequal bell towers, one built for the monks and one, later and taller, for the canons, a reminder of the long rivalry between the two communities who shared the church. Inside, the nave is dim, broad and solemn, with heavy brick piers and ribbed vaults. The treasures cluster at the east end. The golden altar, made in the ninth century by the goldsmith Vuolvinio, is a masterpiece of Carolingian art, covered with gold and silver panels showing the life of Christ on the front and of Ambrose on the back. Above it rises a ciborium on porphyry columns, and in the apse a large mosaic glitters in gold. Beneath the altar, the crypt holds the remains of Ambrose and the martyrs Gervasius and Protasius, dressed and visible in a glass casket. In a side chapel, the Sacello di San Vittore in Ciel d'Oro preserves fifth-century mosaics, including what is thought to be the earliest surviving portrait of Ambrose. In late 2025 a new treasury museum opened to show the basilica's precious objects, textiles and documents. Outside, the stump of a Roman column in the square is known as the Devil's Column, and its two holes are said to be marks of the devil's horns.

Visiting: the basilica is open for worship from early morning to evening, and for sightseeing in the late morning and afternoon on weekdays and Saturdays, with shorter afternoon hours on Sundays and holidays; avoid visiting during services. Entry to the church is free, while the treasury museum and some chapels may require a ticket. Dress respectfully, with shoulders and knees covered. The basilica is always busier around 7 December, the feast of Saint Ambrose and the start of Milan's holiday season.

How to see it: walk slowly through the atrium and look back at the facade and towers before you enter. Inside, go straight up the nave to the golden altar and ask the sacristan whether the rear panels are visible, then go down to the crypt. Find the Sacello di San Vittore in Ciel d'Oro off the right aisle for the mosaics, and look for the Bramante portico on the left side of the church, part of a cloister project that the Università Cattolica now occupies next door. Allow forty-five minutes, more if you add the treasury.

Combining it: the basilica is next to the Sant'Ambrogio stop on metro line M2, two minutes from the Leonardo da Vinci Science and Technology Museum and about ten minutes' walk from Santa Maria delle Grazie and the Last Supper. San Maurizio al Monastero Maggiore, with its frescoed interior, is a short walk away on Corso Magenta, which makes this the best half-day of churches in Milan.