Granny Weatherwax and Eskarina arrive at the Unseen University:
"The big doors swung back, revealing a wide courtyard surrounded by lawns. Behind them was a great rambling building or buildings: it was hard to tell, because it didn't look so much as if it had been designed as that a lot of buttresses, arches, towers, bridges, domes, cupolas and so forth had huddled together for warmth.
'Is that it?' said Esk. 'It looks sort of--melted.'
'Yes, that's it,' said Treatle. "... Of course, it's a lot bigger inside than out, like an iceberg or so I'm given to understand. ...'"
From Equal Rites by Terry Pratchett