Colombia - Port, Fortresses and Group of Monuments, Cartagena

"Situated in a bay in the Caribbean Sea, Cartagena has the most extensive fortifications in South America. A system of zones divides the city into three neighbourhoods: San Pedro, with the cathedral and many Andalusian-style palaces; San Diego, where merchants and the middle class lived; and Gethsemani, the 'popular quarter'." 

Source: UNIESCO World Heritage