Castle (structure)
From The Heroes of Might and Magic III wiki
A Castle is one of the most important sturctures in any town. It provides the town with additional defense- third level wall, a moat and three Arrow Towers). Even more importantly, it increases basic creature growth in the town by 100%. It is a prerequisite for the Capitol. The Castle can be built in any town, provided that the mapmaker hasn't disabled it.
Requires: Citadel.
