Al Qahirah is one of the governorates of Egypt. Its capital is the national capital of Cairo, which means "The Vanquisher" or "The Triumphant", is the capital city of Egypt. While Al-Qahirah is the official name of the city, in Egyptian Arabic it is typically called simply by the name of the country, Masr. It has a metropolitan area population of officially about 16.1 million people.[citation needed] Cairo is the twenty-first most populous metropolitan area in the world. It is also the most populous metropolitan area and the most populous city in Africa.Today, Greater Cairo encompasses various historic towns and modern districts into one of the most populous cities in the world. A journey through Cairo is a virtual time travel: from the Pyramids, Saladin's Citadel, the Virgin Mary's Tree, the Sphinx, and ancient Heliopolis, to Al-Azhar, the Mosque of Amr ibn al-A'as, Saqqara, the Hanging Church, and the Cairo Tower. It is the Capital of Egypt, and indeed its history is intertwined with that of the country. Today, Cairo's official name is Al-Qahira (Cairo), although the name informally used by most Egyptians is "Masr" (Egyptian Arabic name for Egypt).