Saints Sergius and Bacchus Church is traditionally believed to have been built on the spot where the Holy Family, Joseph, Mary and the infant Jesus Christ, rested at the end of their journey into Egypt. They may have lived here while Joseph worked at the fortress. The church is of significant historical importance, and in fact, it is where many patriarchs of the Coptic Church were elected

The Hanging Church is named for its location above a gatehouse of Babylon Fortress, the Roman fortress in Coptic Cairo (Old Cairo); its nave is suspended over a passage. The church is approached by twenty-nine steps; early travelers to Cairo dubbed it "the Staircase Church". The land surface has risen by some six meters since the Roman period, so the Roman tower is mostly buried below ground, reducing the visual impact of the church's elevated position

The synagogues have included a geniza, or repository for abandoned or outdated documents containing the name of God, since Jewish teaching is that such papers had to be stored with reverence, and then eventually buried in a cemetery. The 11th-century building incorporated an unusually large geniza, "two stories high, more silo than attic – with a rooftop opening accessible from above