Before #AlcatrazFederalPenitentiary, it was used by the #USArmy as #FortAlcatraz in the #ThirdSystem of fortifications, despite not aligning with the system. Completed in 1859, it also played a role in the #CivllWar, gathering recruits before becoming a military prison in 1868. #photography #wa #california #architecture #californication #canon80d #colorphotography #bwphotography #travel #photos #trivia #history #americana