We just learned about the Bastion that sticks out from the curtain wall.
Another castle fortification is a Keep.
This is a tall tower that is part of a castle where someone would hide out if the rest of the castle was being attacked.
Sometimes a keep was surrounded by another big curtain wall, and the kings or owners of the castle would stay in the keep to be protected in case someone broke through the other fortifications.
(from: wikipedia - keep)
Kid Facts - Blast from the past: Prague Castle
