It's called a portcullis. More information on wikipedia.
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.
The castle at Disneyland is Sleeping Beauty's Castle. The one is Disney World is Cinderella's castle.
Castle Gate Mine disaster happened in 1924.
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.
Originally Rochester castle had a drawbridge outside its main gate on the east side of the castle. Neither the gate nor the drawbridge exist today.
The ditch around a castle is called a moat.
The word Motte is a proper word for a natural or man made mound on which a castle was erected
A gate house is a building by a gate of the castle to provide shelter and protection for the gatekeepers. It is often part of the outer wall of the castle. It may actually be a house where the gatekeeper lives or it may be small fort that could be staffed with soldiers.
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