Green Angel Tower is a fictional structure from the fantasy series Memory, Sorrow, and Thorn by author Tad Williams. It serves as a significant location in the story, representing both a place of refuge and a site of conflict. The tower is known for its impressive height and intricate architecture, symbolizing the power and history of the world in which it exists. The narrative surrounding Green Angel Tower involves themes of hope and despair, as characters navigate their challenges within its walls. The tower is also tied to the overarching battle between good and evil, making it a pivotal element in the series' plot development.