longform.org

This is a site which collects the best/most talked about pieces of journalism from all over. Here are some to start with:

http://www.slate.com/id/2300916/

If you've watched The Wire, this one is amazing, although very violent and upsetting and things, but if you are watching The Wire you're probably looking forward to that:
http://longform.org/2011/07/25/the-story-of-a-snitch/

http://longform.org/2011/07/16/i-thought-you-were-a-poet-2/