A tower at the entrance to a castle or fortified town
An opening in the wall of a fortress through which the guns are levelled; a narrow loophole through which arrows and other missiles may be shot.
A fortress at the end of a bridge.
A temporary wooden tower built for defensive purposes.
A strong fortress that sits high above a city.
A stronghold or fortified place.
An armoured portion of a warship, housing important equipment.
A Salvation Army meeting place.