The city of Jerusalem has a history spanning back to the 4th millennium BC, making it one of the oldest cities in the world. Its current layout however largely originates from the Bizantyne period and the city walls were erected only in the 16th century. The city in divided in Christian, Jewish, Muslim and Armenian quarters. The walled old city, a UNESCO World Heritage site, is one of the most interesting archaeological sites in the world. It contains of some of the most holy sites for Christianity, Judaism and the Muslim faith: the Church of the Holy Sepulchre, the Western Wall and Temple Mount with the Dome of the Rock and the Al Aqsa mosque. The city draws a large number of tourists every year, many of whom come here for religious reasons. The status of Jerusalem remains one of the core issues in the Israeli-Palestinian conflict. Israel's annexation of East Jerusalem has been repeatedly condemned by the United Nations and related bodies.