 This Struthion Pool was originally built as part of an open-air water conduit by the Hasmoneans, which has since been enclosed; the source of the water for this conduit is currently unidentified.As a result of 1971 extensions to the original Western Wall Tunnel, the Hasmonean water system, which runs under Arab housing, became linked to the end of the Western Wall Tunnel, and later opened as a tourist attraction.The course takes a linear route starting at the Western Wall Plaza and passes through the modern tunnels and the ancient water system, ending at the Struthion Pool.