While non-Muslims can’t visit Sidi ben Nassir’s green-roofed mausoleum, anyone can visit the library inside the adjacent medersa for Quranic scholars. Among the 4000 books on these glassed-in shelves are ancient medical, mathematics, algebra and law texts, in addition to splendid 13th-century Qurans written on gazelle hide. You'll find it through an arch in the northwest corner of the main square.
