You can spend years photographing Italy. The eternal city (Rome) in particular has thousands of incredible buildings, sculptures, and artifacts a photographer could easily have back-to-back 365 Projects and never run out of things to capture.
For those who love light, Rome has dozens of buildings where light is dramatized and romanticized. The city itself is loaded with activities and is perfect for Street photography. Finally, given the hight location, there are plenty of great landscape images to capture even in such a congested city center.