Hmm, this is a rather old topic.... Oh well.
I definitely think that Welsh castles are great inspiration, like Maedhros (thanks for that link, BTW. I'm bookmarking it). They're quite beautiful.
Oh, and kelderic, I think it's kind of neat that some of the best castles are ruined, it lets us make up the rest.
Say it "ESS-MICK-GIN
-ISS", with a hard "G", as in "get".
I'm a Pumpkin.Free Rice