I have started a thread to cater for urban images that do not seem to fit in any other category. (Not that I can find, at least). Urban Exploration in my view are images that show a cross section of Urban Life and do not really have people in the composition. The theme isn't about architecture and instead lends itself to culture and society reflected from an urban perspective. I guess the Urban images I am thinking of could have people in them however the buildings and environment are the main theme.