Basilica della Santissima Annunziata
I really liked this church. There was a service in progress when we went, and a watcher-woman near the entrance giving anyone who looked less than well-behaved the evil eye. When a woman trailed her two little dogs in on leashes, oh boy. The church lady chased her down an aisle and watched her very, very hard.
Not crowded like other city landmarks, with a beautiful, ornate interior.