Gian Giacomo Dolcebuono and Giovanni Battagio designed Santa Maria dei Miracoli presso San Celso in Milan in 1493, after a miracle drew more devotees to a small chapel built in 1430 to shelter a fresco of the Virgin and Child. The octagonal dome was built first, from 1494 to 1498, and the church was enlarged by 1506. Giovanni Antonio Amadeo designed the tambour decoration and the barrel vault.
Galeazzo Alessi designed the facade, which Martino Bassi built. The article calls it eclectic and Mannerist, with Adam and Eve by Stoldo Lorenzi and Sibyls by Annibale Fontana. A classical square portico stands in front. The presbytery has a polygonal ambulatory modeled on the Milan Duomo's.
The older San Celso church next door was begun around 396 after St Ambrose reportedly found the tomb of Saints Nazarius and Celsus. It remains an active church.

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