Stone walls that have looked out over the Caribbean for five centuries. Inside, Cartagena is a burst of color: balconies heavy with bougainvillea, plazas where champeta plays, and mansions painted mango and turquoise. By day you chase the shade with a cold juice; by night, the fortresses light up and everything smells of sea salt and rum. Colombia's Caribbean jewel — a World Heritage Site and pure tropical seduction.