Within the Endicott structures there are of course magazines for the huge shells intended to be flung at the expected Spanish and/or British and/or Russian and/or German seaborne force. These magazines aren't the brick casemates with gorgeous vaulted celings of the 1850's, but the ugly, low-ceilinged steel-and-concrete hovels of the 1890's. Check out all those cool little rocks that were mixed into the concrete!