The Western Wall, Wailing Wall, or "Kotel" in Hebrew is a segment of a retaining wall of the Temple mount from times of Herod the Great. The Wall and its plaza considered holy places due to their connection to the Temple Mount and used for prayer by Jews. This wall is almost the only open segment of the western wall of the supporting substructures that give the natural hill of the Temple mount a geometrically regular shape. The wall has also been called the "Wailing Wall," referring to the Jewish practice of wailing at the site at Tisha B'Av, the day of national mourning for the Temples. The Jewish prayer was held continuously at the place except for 19 years after the Israel Independence war when under Jordanian control, Jews were expelled entirely from the Old City. This period ended on June 10, 1967, when Israel gained control of the place following the Six-Day War.
Photo By Yourway-to-israel - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=33380172