Mosque of al-Hakim bi-Amr Allah — Cairo

The congregational mosque of Imam al-Hakim bi-Amr Allah (AS) — the 16th Fatimid Imam and 6th Fatimid Caliph — built in Cairo between 990 and 1013 CE. Named after the Imam who oversaw its completion, it stands at the northern gate of medieval Cairo (Bab al-Futuh), just inside the Fatimid walls. After the fall of the Fatimid Caliphate, the mosque fell into disuse and suffered neglect over centuries, serving at different times as a stable, a prison, a warehouse, and a museum of Islamic art. The most extraordinary chapter in its history came in the 1980s when the Dawoodi Bohra community — under Syedna Mohammed Burhanuddin (RA) — undertook a comprehensive restoration of the mosque. Completed in stages over several decades, the restoration returned it to full religious use for the first time in centuries. It is the only major Fatimid-era mosque in Cairo still used as an active place of daily prayer. The mosque's twin minarets — among the oldest surviving minarets in Egypt — are architectural masterpieces with their unusual cylindrical forms.