Wiki Loves Monuments: "World's largest photo contest" seeks to create a visual record of world monuments and historic sites on the Wikimedia Commons. The USA version focuses on sites listed on the National Register of Historic Places. Canadian version here. If you don't see your country among the 30 participating so far, you can volunteer!
Love thy Neighbor Photographer and author Steven Hirsh has photographed the homes of registered New York State sex offenders. A wonderful writer and photographer, this work is chilling, alarming, beautiful. I get that Quentin Tarantino feeling of beauty and disgust. Look at me, nooooo look away. The series of 24 images are on Hirsch's website.
Inner City Youth, London "In 2002, Simon Wheatley began photographing London's publich housing developments...and was able to obtain a level of intimacy with his subjects that provides a true picture of the daunting project of growing up in the intimate confines of drug use, societal neglect, and poverty." This (Flash-based) narrated slideshow features Wheatley's work, and is a look at the culture...and also the music (grime) "as an artistic response to the place and circumstance, an expression of the violence, bleakness, and neglect..." (via Future Feeder)
Syashin Mania is a collection of photos of pop culture Japan. In this case it is fan car art of Ayumi Hamasaki, a popular singer. (Some other pages on the site are NSFW.)