Baluarte de San Antonio, also called Castillo de Moch-Cohuo, is Champotón's clearest reminder that this quiet coast once sat inside a dangerous Gulf world of raids and coastal defence. It is not a grand fortress like the bastions in Campeche city, but it gives the town a useful historical anchor.
Stop if you are walking the centre. The value is in the context: Champotón was never just a fishing town, and the fort helps explain why the Spanish coast here was watched so carefully.