Turret
TUR'RET, noun [Latin turris.] A little tower; a small eminence or spire attached to a building and rising above it.
And lift her turrets nearer to the sky.
1. In the art of war, movable turrets, used formerly by the Romans, were buildings of a square form, consisting of ten or even twenty stories, and sometimes one hundred and twenty cubits high, moved on wheels. They were employed in approaches to a fortified place, for carrying soldiers, engines, ladders, casting-bridges and other necessaries.