If it drops it is called a portcullis.
tut
A castle is a fort. It was designed to be a place where people could stay in times of trouble. Typically it had a raised area called a motte, a curtain wall or palisade, and an open area within the wall called a bailey. Early castles were made of wood, and later ones made of stone. The stone castles usually had a large building called a keep, which often looked like a large tower. There was a gate house with a gate that could be easily defended. Often the castle was surrounded by a moat and getting to the gate meant crossing a drawbridge. The moat was often full of water. There is a link to an article on castles below.
A gatehouse is a building at the gate of a castle or fortified town or city. It is intended to provide defense of the gate. It was often also used as a place where members of the garrison could sleep, so they could be called to defend more quickly. It often included mechanisms that could raise and lower a drawbridge or portcullises. In a castle it was usually the strongest position in the curtain wall.
There are three entrance gates on Fort Knox. They are the Chaffee Gate, the Brandenburg Gate, and the Wilson Gate. Normally there are at least 2 guards in each gate shack. There are also Military Police as Fort Knox is a military post.
Arbeit Macht Frei is written on the gates and literal translation would be work is liberating.
The portcullis.
it means vertical sliding gate that protects a castle.
The heavy iron gate on a barbican wall is typically called a portcullis. It is a defensive feature designed to block entry and protect the entrance.
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 gatehouse is the structure that defends the main gate, so the gatehouse is always at the entrance.
Bharatpur.
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.
A portcullis is gate that drops in front of a Castle door. A drawbridge is a moveable structure that allows access across a moat to the Castle door.
A portcullis is a heavy gate made of wood or metal that is raised or lowered vertically to block entry to a castle or fortification. It is typically operated using a system of pulleys, ropes, or chains. The portcullis can be controlled from inside the castle to allow or restrict access through the entrance.
Well, a gatehouse is a part of a castle that is heavily defended. The gate house includes a drawbridge and maybe murder holes. If attackers get in, defenders could shower them with rocks, red hot sand, or boiling water and oil through the muder holes in the ceiling. A heavy metal portcullis protected the gate house enterence
Other names for an entrance gate are: access gate entry gate
it is called a portcullis