Built between 1763 and 1774, this is one of the largest colonial fortresses in the Americas. During the 1800s the surrounding moat was used by firing squads to shoot independence patriots—poet Juan Clemente Zenea was amongst those executed here. It was then used as a military prison until the triumph of the Cuban revolution, when it became Ernesto "Che" Guevara`s headquarters. Today it houses the Fortresses and Weaponry Museum.