Murder holes are openings in the ceilings of castle gateways or passageways, designed for defense. They allowed defenders to drop or pour harmful substances, such as boiling oil or stones, onto attackers trying to breach the entrance. This strategic feature helped protect the castle from invaders. These holes were often found in conjunction with other defensive structures, such as moats and drawbridges. The design of murder holes reflects the importance of fortifications in medieval architecture, showcasing how castles were built to withstand sieges and protect their inhabitants from threats.