Cartagena is certainly the crown jewel of Colombia. Situated right on the sparkling Caribbean coast, this destination impresses with its 18th-century walled city, its candy-colored collection of old colonial homes and soaring clock tower, and its maze of cobblestoned streets that weave through the historically significant forts, buildings and churches.The pinnacle of the city is the UNESCO Old Town. Convent and Church of San Pedro Claver, Spanish Jesuit priest who dedicated his life to the service of slaves. He is known as the “apostle to the slaves” and was canonised a saint by the Catholic Church in 1888. The Castillo…