The Wire. It's the best piece of visual media ever created. Not only is it the best portrayal of the inner city drugs trade but also the decaying institutions and social structures that allow it to flourish, and the corrupting influence of dirty money.

It also is consistently the best written show on TV and is grounded in it's reality better than anything else. Half the cast were complete unknowns, in many cases plucked from the streets of Baltimore itself and there are standout performances all across it's vast and diverse cast.

It's a little slow to get going, the first few episodes have a lot of ground to cover to get the viewer up to speed, it also makes no effort to ease the viewer in, with a lot of jargon, slang and some very thick accents to content with, there's also no "previously on the wire" to go over key points from earlier episodes so it definitely requires more participation from the viewer than most TV but it's all the better for it.