Old Cairo 

Old Coptic Cairo (Masr al-Qadima):
    
The oldest part of Cairo, and predates what is now modern Cairo. It is believed that there was a settlement here as early as the 6th Century BC.
   
Later the Romans built a fortress here which we know today as "Babylon". Some of these Roman walls still exist today.
   
After the Spread of Christianity throughout Egypt, it became a Christian Stronghold, with as many as twenty churches built within an area of just one square mile. Now only five remain "the church of St. Sergius/the Hanging Church/the church of St. George/the church of St. Barbara/the church of St. Menas/the church of the Holy Virgin in Babylon Al-Darag…... along with the earliest mosque ever built in Egypt (Amr Ibn Al As-mosque).
   
After the fall of Jerusalem in around 70 AD, the area saw an influx of Jews, and it's here where Egypt's old Synagogue, Ben Ezra is located.