The Hanging Church
The most famous site in Coptic Cairo is the Church of the Virgin Mary, better known by its nickname, the Hanging Church. This name comes from the fact that it was built atop the walls of the 4th century BC Roman fortress of Babylon, the remains of which are still visible about Coptic Cairo.
The Hanging (The Suspended) 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".