is one of the largest building blocks in the world. The stone is long, wide and has an estimated height of . It is considered to be one of the heaviest objects ever lifted by human beings without powered machines. It is the largest building stone found in Israel and second in the world. It is only partially intact, the rest was destroyed in 70 CE during the Roman siege of Jerusalem. Roman theater-like structure A small Roman theater-like structure was discovered directly below the Arch. The theater was never finished, this being possibly the result of the Bar Kokhba Revolt or the death of Emperor Hadrian (r. 117–138). Mamluk-Ottoman "Al-Buraq" Pool The modern synagogue under the arch covers the Mamluk-Ottoman cistern known in the time of Wilson and Warren as the 'Pool Al Burak'. Makhkama building Over the prayer hall area partially covered by the Arch is the large building known as the Makhkama or Tankiziyya, that includes a porch looking over the Temple Mount. Former Chief Rabbi Shlomo Goren used to use that porch to recite special "Kinot" prayers on the night of Tisha B'Av. Modern synagogue After the 1967 Six-Day War, the space under the arch was transformed into a synagogue. In 2005, the Western Wall Heritage Foundation initiated a major renovation effort under Rabbi Rabinovich, then-rabbi of the wall ("Rabbi of the Kotel", as the title is usually referenced, using the Hebrew word for the Wall). Israeli workers renovated and restored the area for three years, strengthening the arch in preparation for access for visitors and use for prayer. Scaffolding remained in place for over a year to allow workers to remove cement that had been applied as patches over the stone. The restoration included additions to the men's section included a Torah ark that can house over one hundred Torah scrolls, in addition to new bookshelves, a library, and heating for the winter and air conditioning for the summer. There is also a new room built for the scribes who maintain and preserve the Torah scrolls used at the Wall. Speakers at the March 12, 2006 dedication ceremony included: President of Israel, Mr. Moshe Katzav, Ashkenazi and Sephardi chief rabbis, Rabbi Yona Metzger and Rabbi Shlomo Amar, the mayor of Jerusalem, Rabbi Uri Lupolianski, the chief rabbi of the Kotel, Rabbi Rabinovich, and the director of The Western Wall Heritage Foundation, Rabbi Mordechai (Suli) Eliav.