Thanks for the kind words about my city's cathedral. A small addition, excuse me but I'm an architect, the 'dome' of the cathedral is properly called 'tiburio', with an octagonal plan and without curved shapes, as a dome must be. Let's gloss over current lighting. Thanks for the video. The Madonnìna (with accent on the i) protect you.
St Peter's is definitely larger than the Milan Duomo, but technically St Peter's is located in a different country - Vatican. It makes Milan's Cathedral the largest church in Italy.
