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Wilson's Arch (Hebrew: קשת וילסון, romanized: Keshet Vilson) is the modern name for an ancient stone arch in Jerusalem, the first in a row of arches that supported a large bridge connecting the Herodian Temple Mount with the Upper City on the opposite Western Hill. The Arch springs from the Western Wall and is still visible underneath later buildings set against the Wall. The name Wilson's Arch is also used to denote the interior hall currently used as a synagogue, which the arch partially covers. This hall opens towards the Western Wall Plaza at the Plaza's northeast corner, so that it appears on the left side of the Kotel’s prayer section along the Western Wall, to visitors facing the Wall.
The Arch once spanned 13 metres (42 ft), supporting a bridge that carried both a street and an aqueduct. The late-Second Temple period bridge stood over a stone-paved street, similar to Robinson's Arch and allowed people to access a gate that was level with the surface of the Temple Mount. Excavations between 2015 and 2019 collected organic material in the mortar used during various stages of construction. Radiocarbon dating indicated that the initial bridge to the Temple Mount was completed between 20 BCE and 20 CE, and a doubling in width occurred between 30 CE and 60 CE. The ground level during the Second Temple period was lower by some 3 m (9.8 ft) than its height during the period of the Early Arab conquest. In the 1980s it was thought that the original stones of the arch lie within the fillings at a depth of about 8 meters below the contemporary paved level, but this was proven to be wrong.
General info from Wikipedia.org
