There’s plenty to feast your eyes on, both inside and outside of the Duomo. Inside, look out for the statue of St Bartholomew, one of the Twelve Apostles, who is depicted wearing his own skin after being martyred. The Duomo also contains a working sundial, decorated with the 12 signs of the zodiac. It also contains a hidden relic, one of the nails from Christ’s cross, which is suspended in its own tabernacle and brought out for veneration annually at the Rite of the Nivola. If you’re visiting Milan at the time then you need to reserve tickets if you want to attend. On the outside of the cathedral, you should look out for a statue of Napoleon, added in gratitude for his help finishing the cathedral. And you might also be able to spot the alleged inspiration for the Statue of Liberty on the balcony above the entrance - she’s wearing the familiar crown and brandishing a torch, but while the Statue of Liberty carries a book, the statue on the Duomo is carrying a cross.