It's possible you're thinking of a specific castle with a unique name or a fictional castle from a book or movie.
To help me find the castle you're looking for, please tell me:
* Any other details you remember about the castle: Is it from a specific book, movie, or video game? Does it have any specific features or a location associated with it?
* What country or region are you interested in?
With more information, I can try to help you find the castle you're looking for.