Taking nearly six centuries to complete, the Milan Cathedral is one of the largest cathedrals in the world. Marvel at the mesmerising stained-glass windows, intricately decorated altars, and ancient columns. Dive into its history at the museum, then you can opt to go underground at the archaeological area to see an octagonal baptistery. Finally, visit the San Gottardo Church built by the Lord of Milan in the 14th century and see its soaring bell tower.