Naples Cathedral, also known as Duomo di Napoli, is the main church in Naples, Italy. It's like the heart of the city, where people go to pray, admire beautiful artwork, and witness the famous Blood Miracle of Saint Januarius. The cathedral has a mix of architectural styles from Gothic to Baroque, and it's a must-visit for anyone exploring Naples. Don't miss the chance to see the vial of Saint Januarius' blood that supposedly liquefies three times a year – it's a real showstopper!