A "Murder Hole" is a term used in medieval architecture, specifically in castles and fortifications. It refers to an opening in the ceiling of a gateway or passageway, allowing defenders to drop harmful objects, such as rocks or boiling liquids, on attackers trying to breach the entrance. This design was an effective defensive strategy to protect the castle from invaders. These openings were often strategically placed above doorways or narrow passages, making it difficult for enemies to shield themselves. The concept of the murder hole is closely related to other defensive features, such as arrow slits and portcullises, which were also used to enhance security during sieges.