In most cases, castles in fictional works are not based on true stories. They are often the product of an author's imagination or drawn from various mythical and legendary elements.
Sure. 'The Glass Castle' comes from a true story. Jeannette Walls wrote about her own life, and the movie adaptation follows that real narrative closely.
Yes. 'The Glass Castle' is based on true events. The author chronicled her own family's struggles and adventures, making it a deeply personal and true-to-life narrative.