I went to the Vatican this summer. I disturbed the worshippers with the loud "clunk" as my jaw hit the floor as I entered St. Peters.
I know what you mean---grin. Someone complained all one does touring Italy is look at churches. Well, that's where all the great art and architecture is.
The Ufizzi Gallery is also a jaw-dropper----was originally designed to host the archives and administrative offices of the state of Florence. In 1737 Anna Maria Ludovica de Medici, the last member of this family (1-2 were Popes) that mentored great artists to decorate churches, converted it into a Museum. The 45 rooms and galleries hold some of the most famous art in the world.
However, even sitting in the piazza sipping cappucino, one is surrounded by art.