Speaking of big cities, in my view, Chicago takes the cake (if you discount the weather in and around winter time, and the wind) for one of the most interesting urban spaces on the planet.
I have always loved big cities. You can get lost in them because of their size or you can get lost in them by being drawn into small pockets of the place that delight with amazing food choices or reveal stories of people who live or have lived in the place. You can wonder at the why of their establishment whether on historic river routes, strategic trade or defence sites or just by chance discoveries.
Taking photographs in cities can be tricky if you’re focusing on the decoration detail of a building or attempting to capture the large scale of a street scape. It is never dull.
Here is a selection of cityscapes (with additives via Grungetastic).