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.

– Bram Stoker

Dracula, Chapter 1. Jonathan Harker arrives at Castle Dracula. The lack of light from the tall black windows shows that there is no good inside. This foreshadows the danger that Jonathan will face when he goes inside.