Baluarte de San Carlos

Begun in 1676, San Carlos was the first of the eight bastions raised around Campeche and set the pattern for the rest of the circuit, anchoring the wall's southwestern angle where the defences met the waterfront. Its construction responded directly to the sack of the city by pirates in 1663 and 1678, part of a wave of attacks that convinced the crown to fund permanent fortifications rather than temporary defences. The bastion is unique among the eight for retaining a vaulted underground chamber, one surviving section of a tunnel system that allowed the garrison and townspeople to move between strongpoints and take shelter during assaults; parts of this network are said to have connected several bastions before later construction sealed most of the passages. Above ground, thick angled walls support a rooftop gun terrace with several original cannon still in place, offering views across the Centro Historico and the harbour. Since the late twentieth century the bastion has housed the Museo de la Ciudad, which uses the chambers and casemates to display a scale model of the complete 17th-century wall circuit alongside weapons, ship models and colonial documents relating to the pirate raids the fortification was built to repel. The building underwent restoration to stabilise its masonry and adapt the interior for museum use while preserving the vaulted chamber and gun platform largely as built.