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Castle Gate Mine disaster happened in 1924.
The gate house.
The gate house.
The Gate House controls the entrance through the wall and into the castle. The castle is the name for the entire fortified building. The gate house, keep, chapel, wall (etc) are different parts of the castle.
A postern gate is a side or less important gate (sometimes hidden) door into a castle;usually for peacetime used by pedestrians
A castle would often have a large, heavily fortified gate. A smaller gate, sometimes with a grille, let into this large gate, was called a wicket.