For photography? I will have only one day there and generally have a trend of just walking around and finding stuff along the way (as I did in boring Bonn and found some great stuff). However, due to limited time, I would like to know what I need to absolutely see for a photographic experience, whether it's a pano of the city, sculptures, buildings, anything. I'll have perhaps only time to see 2-3 things that are planned, at the most, before I must continue walking. Besides the normal culture, are there areas where there's a bit of an "undersociety", where the streetkids, graffiti artists, druggies, and others convene? I'd like to get a whole picture for the photographic experience. The latter seems strange, but I'm from NYC, so that might explain some attitudes.