Medersas are schools for study of the Quran. They declined in the late 19th century when broader education came into vogue. Fine examples - mostly still used as schools - are clustered around the Zaytouna Mosque. Medersa Palmier, still a Quranic school, was constructed in 1714 on the site of a funduq (travellers' inn) and named after a long-gone tree. Identify it by its yellow studded door.