Fort Ward had two 200-foot long, 12.5-foot wide bombproofs running through its center. These bombproofs were built to serve as temporary protection for troops under bombardment, and could be used as a stronghold if the fort's walls were breached. As the nice, chatty gentleman in the visitor's center told me, the interior of these structures was of course all wood, which is why all that's left today are two majestic, lengthy piles of dirt.