Six bastions means six opportunities for this shot! This one is Fort Jefferson's southwestern bastion. Curiously, you will note that this bastion does not bother with an opening for a gun pointing outward, or with the charmingly ridiculous white beak...does this make it a "female" bastion? I only suggest its gender because, in the early days of the development of the tank, tanks without cannon were known as "females" of the species.