In April 2008, in Hadayeq el Qobba I stumbled upon this synagogue which was turned into a public affairs office, NDP office, a nursery and a small mosque.
Taking photos is strictly prohibited. But I managed to snap some shots while claiming that I am studying architecture and interested in the building style.
This is apparently the most looked after synagogue in Egypt. Thanks to Farouk Hosni. Probably the next president of the UNESCO.
UPDATE: Yes, it is "the most looked after" synagogue as in the wooden floors are in a horrible shape, cables coming and going everywhere, horrible neon lights, overstuffed filing cabinets piled over each other rusting, broken window panes replaced with cardboard and the whole sanctity of the place, that was once there and can be vaguely felt radiating from the large dome and the star of David windows, is replaced with a grim dark grey Mogama3 feel.
UPDATE 2: Lina Atallah and Mohamed El Dahshan of Al-Masry English went and investigated this synagogue: The curious case of a Cairo synagogue.