We come around the side of the fort to its entrance...and hey look, there's one of those aforementioned cracks now! What would the NPS do about such a crack? I've seen some haphazard-seeming masonry patches used in some crumbling starfort situations, but the only real way to correct such damage would be to tear the area down and brick it back up again...which I can't see anyone doing, due to the immeasurable historical significance of these forts, and the lack of both cheap materials and slave labor that made so many American starforts feasible in the first place.