This is Egypt's oldest remaining synagogue, built on the ruins of another older synagogue thought to have been founded in the fifth century BC. It was later converted into a Coptic church, but in 1115, Rabbi Abraham ben Ezra, with the consent of the Coptic patriarch, restored the land and rebuilt the synagogue, which has since been impeccably restored. Daily 9 am-5 pm. Free. Behind the Coptic Museum (Old Cairo), Cairo.