I agree with Larb's comment. For examples of that kind of thing, perhaps your best bet is to look at Asia - China's Forbidden City, Japan's Himeji Castle, and/or India's Red Fort. I read Gormenghast years ago, and I think of it being more chaotic (and European) than those examples, but hopefully they'll be helpful anyway.

Also, this link (if it works) is a Google Image result for 'Topkapi Palace': http://www.bestourism.com/img/items/...alace_3357.jpg

Seems to fit Larb's description. Nice idea, by the way, Rob.