 In the centre of the bazaar area is an ornamental fountain (19th century); at the north end is the Mosque of Omar, built in 1216 by Saladin's son to commemorate Caliph Omar's visit to Jerusalem in 638, when he prayed on the steps of the Church of the Holy Sepulchre instead of inside so that it could remain a Christian holy place.Excavations of the Muristan were conducted around the start of the 20th century, and showed that the Hospitaller complex occupied an approximately square area measuring 160 yards (east-west) and 143 yards (north-south).In the early decades of the twentieth century little was left of the original buildings.