After leaving the Citadel we headed over to an area which is thick with very, very old religious buildings: churches, monasteries, mosques, and even a synagogue. We entered a warren of alleyways and walked a few minutes to the Ben Ezra Synagogue.
The synagogue is maybe 1200 years old and is built on the site of a Coptic church so it's kinda churchlike in its interior arrangements. We weren't allowed to take photos inside
but someone else did, so click here if you want to see what it looks like. I believe this synagogue is no longer used for worship. There is at least one active synagogue in Cairo, we drove past it one day, but it isn't pretty like this one. It kinda looks like a concrete bunker.