Hahaha, what a good question! You're the first person to ask this! Actually, I loved the Cathedral of Santa Maria Assunta, because it has such unique mosaics, and I love the combination of colorful patterns and gray marble! Also the inside of the cathedral is so unique!
Also, just how I said In my article, I was so surprised about connection of Galileo Galilei and the tower. That's interesting to know that such an incredible person, and also physicist did his experiments in this tower. Also it was surprising to know, that many different people were building the tower, but they still retained the main idea!