The Giralda is the bell tower of the Seville Cathedral in Seville, Spain. It was originally built as a minaret during the Moorish period, during the reign of the Almohad dynasty with a Renaissance style top subsequently added by Spanish conquistadors after the expulsion of the Muslims from the area. The Giralda was registered in 1987 as a World Heritage Site by UNESCO along with the Alcazar and the General Archive of the Indies. The tower is 104.1m in height and remains one of the most important symbols of the city, as it has been since medieval times.HistoryConstruction of the tower began under architect Ahmad Ben Baso in 1184. After Ben Baso's death, other architects continued work on the tower. The mathematician and astronomer Jabir ibn Aflah (or Geber) is also often credited with the tower's design. The tower was completed March 10, 1198 with the installation of copper spheres on the tower's top. The Almohads built similar towers in what are now Spain and Morocco during this period. The tower of the Koutoubia Mosque in Marrakesh served as a model for the Giralda and its sister, the Hassan Tower in Rabat.