Urban photography is full of fantastic subjects for your camera: monuments, squares, markets, superb views, ancient or modern buildings, people. The urban environment offers a wide variety of subjects in a restricted area, more than any other existing photographic category. From a terrific night skyline to the day frenetic street activity, from close-up architectural details to busy markets, every city, big or small, provides plenty of exciting photographic opportunities.
Years ago, I read somewhere New York is the most photographed city in the world. No wonder about it. New York could not be beaten as the undisputed capital of the world in many regards, though is not even capital of its country, the USA.