Dungeon
room or cell in which prisoners are held, usually during the Middle Ages and Renaissance
A dungeon is a room or cell in a castle to keep prisoners. Most dungeons are underground, others are high up in towers.
An oubliette is a type of dungeon that can be entered by using a trapdoor in the ceiling. People were thrown into an oubliette from the ceiling and left there to starve or dehydrate to death, making it akin to immurement.
