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Dungeon
room or cell in which prisoners are held, usually during the Middle Ages and Renaissance / From Wikipedia, the free encyclopedia
A dungeon is a room or cell in a castle to keep prisoners. Most dungeons are underground, others are high up in towers.
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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.