The Old City is a 0.9 square kilometers walled area within the modern city of Jerusalem.
Until 1860, when the Jewish neighborhood Mishkenot Sha'ananim was established, this area constituted the entire city of Jerusalem.
The Old City is home to several sites of key religious importance: the Temple Mount and Western Wall for Jews, the Church of the Holy Sepulchre for Christians and the Dome of the Rock and al-Aqsa Mosque for Muslims. It was added to the UNESCO World Heritage Site List in 1981.
Traditionally, the Old City has been divided into four uneven quarters, although the current designations were introduced only in the 19th century. Today, the Old City is roughly divided into the Muslim Quarter, Christian Quarter, Armenian Quarter and Jewish Quarter. The Old City's monumental defensive walls and city gates were built in the years 1535–1542 by the Turkish sultan Suleiman the Magnificent. The current population of the Old City resides mostly in the Muslim and Christian quarters. As of 2007 the total population was 36,965; the breakdown of religious groups in 2006 was 27,500 Muslims; 5,681 Christians, not including the 790 Armenians; and 3,089 Jews.