Islamic Cairo, also called Historic Cairo or Medieval Cairo, refers generically to the historic areas of Cairo, Egypt, that existed before the city's modern expansion during the 19th and 20th centuries; particularly the central parts around the old walled city and around the Citadel of Cairo. The name "Islamic" Cairo refers not to a greater prominence of Muslims in the area but rather to the city's rich history and heritage since its foundation in the early period of Islam, while distinguishing it from with the nearby Ancient Egyptian sites of Giza and Memphis. This area holds one of the largest and densest concentrations of historic architecture in the Islamic world. It is characterized by hundreds of mosques, tombs, madrasas, mansions, caravanserais, and fortifications dating from throughout the Islamic era of Egypt. In 1979, the United Nations Educational, Scientific and Cultural Organization proclaimed Historic Cairo a World Cultural Heritage site, as "one of the world's oldest Islamic cities, with its famous mosques, madrasas, hammams and fountains" and "the new centre of the Islamic world, reaching its golden age in the 14th century."