Hogfather - Castle

The Castle of Bones loomed over her now. It certainly deserved the capital letters, up this close. She'd seen a picture of it in one of the children's books. Despite its name, the woodcut artist had endeavored to make it look ... sort of jolly.

It wasn't jolly. The pillars at the entrance were hundreds of feet high. Each of the steps leading up was taller than a man. They were the greygreen of old ice. Ice. Not bone. There were faintly familiar shapes to the pillars, possibly a suggestion of femur or skull, but it was made of ice.

Binky was not challenged by the high stairs. It wasn't that he flew. It was simply that he walked on a ground level of his own devising.

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Hogfather - p134