La Ciudadela de México - there were arms and ammunition stored here and was strategically important, for local control, for example, leading up to the Mexican Revolution. It is mentioned several times on the "La Verdadera Historia de México"podcast. https://www.spreaker.com/episode/gustavo-a-madero-y-la-revolucion-mexicana--58745170

https://es.wikipedia.org/wiki/La_Ciudadela_(Ciudad_de_M%C3%A9xico)