A dungeon is a dark, often underground room or cell used for imprisonment or storage. Historically, dungeons were part of castles and fortifications, serving as places to hold prisoners, especially during medieval times. They are typically characterized by their stone walls, minimal light, and damp conditions. In modern culture, dungeons are commonly associated with fantasy settings, such as in video games and tabletop role-playing games like Dungeons & Dragons. In these contexts, dungeons are designed as adventure locations filled with challenges, monsters, and treasures for players to explore and conquer.