I'm not from Georgia but I've been there a few times and its pretty cool, you can spend a few hours just walking around (It's kinda like walking around in a big underground mall). I don't remember anything in particular (its been a few years) other than coming out at the Coke museum, but I'd say if you are into the whole site seeing thing, it is definitely a good and inexpensive choice(assuming you don't go buy tons of stuff). Head over there for a few hours and check it out.
