Athelstane went up once.

He said it was like being on the top of a mountain, and you could look all over the town." "What's that queer stone box thing on the wall ?" asked Verity, still gazing upwards.
Ingred followed the line of her friend's eye to a point above the pillars but below the Nuns' Ambulatory.

Here, built out like an oriel window, was a curious closed-in-gallery of stone, pierced in places by tiny frets.

It seemed to have nothing to do with the architecture of the Abbey, and indeed to be a sort of excrescence which had been added to it at some later date.

It spoilt the beauty of line, and would have been better removed.
"Oh, that's the peep-hole!" said Ingred, lowering her head, for it was painful to stretch her neck in so uncomfortable a position.