What is Florence famous for?

Due to all the religion Florence used to have, the church there is very famous Saint Peters Basilica. Because, that church had Michalangelo. He worked on the art of that church all over. Everyone that goes to Florence always goes through that church first. If you look at the architecture of that church you'll see that it is formed like a cross. Also, they made the church where wherever you stand there is some 3-D art, and that was very hard for them to do back then.