If you're short on time or just want to make sure you get to see the highlights of the cathedral, be sure to explore the central nave. The statues were actually carved by Jacopo della Quercia. It is considered the most precious piece of artwork in the Duomo, which leads to a great deal of tourist traffic. It is also less crowded, except during July and August, when it is crowded with tourists all day. And if you do stop in, be sure to step on the testicles of the Taurus mosaic on the floor.
Locals swear it brings good luck.
The Pope Martino V consecrates the High Altar. After the crypt, required by S. Carlo for the choral Officiation of the Canons, Cardinal Federico Borromeo orders the construction of the dark crypt, where the remains of S. Carlo are kept and worshipped. The Duomo is declared a National monument. The excavations to recover the remains of the ancient basilica and baptistery start. The works of restoration end.