Today is the Feast of St. Ambrose, the great archbishop of Milan. His relics are in the Basilica of Sant’Ambrogio in Milan.
St. Ambrose is the one in white.
Here are some images of the Lombard Gothic Duomo of Milan.
Excavations beneath the Duomo have uncovered the baptistery where St. Ambrose baptized St. Augustine.
Here is the crypt-tomb of St. Charles Borromeo in the Duomo of Milan.