A big ol' 15-inch Rodman Gun atop the Ravelin. The "Area Closed" sign made my heart sink a great deal, as I envisioned being forbidden from doing any sort of exploratory climbing at Fort McHenry, a cruel shock after clambering gleefully over, under and through various other historical forts. As it turned out, there are some opportunities for climbing and exploration at Fort McHenry, but, being the huge tourist attraction that the fort is, one's opportunities for getting one's knees dirty are pretty restricted.