The Alc?zar de Col?n, or Columbus Alcazar, located in Santo Domingo's Ciudad Colonial, Dominican Republic, is the oldest Viceregal residence in America, and forms part of the Ciudad Colonial UNESCO's World Heritage Site. It was built on a plot close to the rock islet that look towards the Ozama river, granted to Diego Columbus, firstborn son of the discoverer of America, Christopher Columbus, by the king Ferdinand II of Aragon, to build a dwelling for him and his descendants on the island Hispaniola, to which he arrived in 1509 as governor.. (Photo by: Jimmy Villalta/VWPics/UIG)