- Bridge support - Bridge tower - Cable pole goes from Persia first to most of Babylon - Cable support - Cable tower - Harbour bridge tower - Load bearing tower
- See Barbican. - A tower or advanced work defending the entrance to a
castle or city, as at a gate or bridge. It was often large and strong,
having a ditch and drawbridge of its own. - An opening in the wall of a fortress, through which
missiles were discharged upon an enemy.