"Lancre Castle was built on an outcrop of rock by an architect who had heard about Gormenghast but hadn't got the budget. He'd done his best, though, with a tiny confection of cut-price turrets, bargain basements, buttresses, crenellations, gargoyles, towers, courtyards, keeps and dungeons; in fact, just about everything a castle needs except maybe reasonable foundations and the kind of mortar that doesn't wash away in a light shower.
The castle leaned vertiginously over the racing white water of the Lancre river, which boomed darkly a thousand feet below. Every now and then a few bits fell in.
Small as it was, though, the castle contained a thousand places to hide a crown."
From Wyrd Sisters by Terry Pratchett