"The Old City is a 0.9 square kilometer (0.35 square mile) area within the modern city of Jerusalem. Until the 1860s this area constituted the entire city of Jerusalem. The Old City is home to several sites of key religious importance... Traditionally, the Old City has been divided into four quarters, although the current designations were introduced only in the 19th century. Today, the Old City is roughly divided into the Muslim Quarter, the Christian Quarter, the Jewish Quarter and the Armenian Quarter."