This is an Atlanta neighborhood I don't know a ton about -- my experiences with it have been brief and random, generally driving through only when I've taken a wrong turn somewhere. Recently, I came down here to get my visa for Russia, and the place sparked my interest a bit.
Castleberry Hill is getting a reputation as the artsy neighborhood around town, and studios abound, but it's still evolving and really, it's hard to tell how it's going to end up. Gated communities and Baptist rescue missions are side-by-side. Trendy art shops are neighbors to long-boarded-up storefronts. Homeless people wander by hip lofts. Fully-renovated buildings are next to overgrown vacant lots and roofless, burned out shells of warehouses.
Once upon a time, this must have been a pretty important part of the city; one of the main railway stations was just a bit to the north, and you can wander down to the still-used tracks to the east. It's filled with long-defunct warehouses, enormous ghost signs still visible.
I idly shot a bunch of photos while strolling about yesterday -- check them out here. They aren't labeled, organized or cropped -- Webshots is being extraordinarily tempermental today and I lack the patience. Eventually, I'll get these all up in a better format on the gsdgsd site, but for now, browse around.