Our second port of call was Cartagena, Colombia. On the Caribbean side of the country and dating back to the 1500's, Cartagena was where the Spanish stored gold and other treasure for shipment back to Spain. A number of attempts were made over the years to capture Cartagena and its wealth. Consequently, a number of fortresses were built there to protect the city. Cartagena's old walled city was declared a UNESCO World Heritage Site in 1984.