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From the text:
Suddenly, I became conscious of the fact that the driver was in the act of pulling up the horses in the courtyard of a vast ruined castle, from whose tall black windows came no ray of light, and whose broken battlements showed a jagged line against the moonlit sky.
In the gloom the courtyard looked of considerable size, and as several dark ways led from it under great round arches, it perhaps seemed bigger than it really is. I have not yet been able to see it by daylight.