During construction of the Sisters of Sion convent, remains of a monumental Roman arch, probably erected by Hadrian in 135 CE, were revealed. Part of the central arch is visible on the Via Dolorosa. The smaller northern arch now holds the main altar in the convent chapel. Within the convent, visitors can see the vaulted Struthion Pool that supplied water to the Antonia fortress. The Roman pavement was once thought to be the place where Pilate condemned Jesus, but it was actually built after the first century.