We just learned about the Butter Churn Tower.
Another part of a castle is a Bastion, also sometimes called a bulwark.
This is a part of the curtain wall that goes around a castle, and it sticks out beyond the wall.
The bastion was made for cannons and other weapons to be further out from the curtain wall, to fight off the people coming to attack the castle.
(from: wikipedia - bastion)
Kid Facts - Blast from the past: Kronborg Castle
