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AOL is not the only corp located in that area. A lot of companies moved there with some setting up their corporate HQ's. That county contains the highest population in the whole state of Virgina.
You should be able to look up the IP(s) to verify whether it/they belong to AOL. I'm not sure they even have a spider. Google powers their search engine. AOL does cache pages but I wouldn't consider that real spidering. As far as I've seen so far, they've only cached pages which their users visited. It could easily be someone just sitting at home sucking up your site. I've had a couple from Northern Virgina try to do that to mine.