Stone batteries curve around Portobelo Bay on Panama’s Caribbean coast, marking one of the most strategic ports in Spain’s American empire. Gold and silver transported across the isthmus were loaded here for Atlantic convoys, making the harbour both immensely valuable and repeatedly vulnerable to attack. The surviving forts are not one castle but a defensive network whose positions, gun platforms and sightlines only make sense when read across the bay.
San Felipe de Portobelo was founded in 1597 to replace Nombre de Dios as a Caribbean terminal. Engineer Bautista Antonelli had prepared fortification plans for the bay and the mouth of the Chagres River from 1586. Over the following centuries, Spanish engineers rebuilt defences after attacks and adapted them to new artillery. Fort San Jerónimo, Santiago and the San Fernando works preserve different pieces of that evolving system, while San Lorenzo stands separately at the Chagres.