Here are two views of the transepts on the sides of the altar.
In the north transept (left) you can admire the elaborate Trivulzio candle holder - an impressive bronze work that stands five metres high and four metres in width - housed within the Duomo since 1562.
In the south transept (right) take a look at the Chapel of San Giovanni Bono.
Interesting fact: there were once two doors in the transepts, which no longer exist today. At the end of the 1500s the Archbishop of the city, St. Carlo Borromeo, ordered the entranceways to be closed as the transept itself had become a shortcut for hundreds of people and vehicles who wanted to avoid walking around the perimeter of the great cathedral.
The comings and goings had become bothersome enough to disturb mass celebrations and prayers, so San Carlo ordered that the doors be bricked up, hence restoring peace to the hallowed interior.