Everything you need to understand or teach The Great Divorce by C. S. Lewis.
The narrator suddenly finds himself in a dismal gray town just before nightfall. It's raining, and the narrator wanders around the dingy streets, looking for direction or at least a better part of town. He never encounters another person; it looks like the entire town is empty, but then he finds a bus station where people are waiting in line. For lack of anything better to do, he stands in line.
The Great Divorce Lesson Plans contain 134 pages of teaching material, including: