The small and enclosed area, also known as Coptic Cairo, is the oldest part of the city and was once known as the Roman stronghold of Babylon; some of the old walls still exist. It is the ancient heart of the Coptic Christian community and although only five of the original 20 churches remain they are interesting to visit, along with the first mosque built in Egypt and the oldest synagogue, a representation of three of the major religions of the modern world. It is a peaceful place to wander around and a respite from the busy city centre. Churches of interest are the Al-Muallaqa (Hanging Church), the oldest Christian place of worship in the city, and St Sergius where the Holy Family reputedly sheltered during their flight to Egypt.

[source:worldtravel.com]