The Western Wall, known in the West as the Wailing Wall, and in Islam as the Buraq Wall, is a portion of ancient limestone wall in the Old City of Jerusalem that forms part of the larger retaining wall of the hill known to Jews and Christians as the Temple Mount. Just over half the wall's total height, including its 17 courses located below street level, dates from the end of the Second Temple period, and is believed to have been begun by Herod the Great. The very large stone blocks of the lower courses are Herodian, the courses of medium-sized stones above them were added during the Umayyad period, while the small stones of the uppermost courses are of more recent date, especially from the Ottoman period.