Cartagena in 3 days: the UNESCO walled city (11km of walls, 1586–1796, the most perfectly preserved Spanish colonial fortification in the Americas — the city that shipped the gold and silver of the Andes to Spain), Castillo San Felipe de Barajas (the most impressive colonial fortress in South America: the underground tunnel system, the 360° Caribbean view), the Islas del Rosario (the most important coral reef archipelago in the Colombian Caribbean), Getsemaní (the most vibrant neighbourhood in Cartagena: the street art, the cumbia, the champeta), San Basilio de Palenque (UNESCO Intangible Heritage: the first free African town in the Americas, the Palenquero Creole language), and the sunset on the walls with the best Colombian Caribbean ceviche.