The Sarajevo Haggadah is a 14th-century illuminated Jewish manuscript — a Passover prayer book — produced in Barcelona around 1350 and brought to Sarajevo by Sephardic Jews fleeing the Spanish Inquisition in 1492. It is one of the oldest surviving illustrated Haggadahs in the world and the most valuable single object in Bosnia and Herzegovina.
The manuscript is housed at the National Museum of Bosnia and Herzegovina and displayed periodically in a specially controlled environment (it cannot be permanently exhibited due to conservation requirements). When it is on display, it is worth going specifically to see it — not just for its historical significance but because the illuminations are genuinely beautiful: bold colours, intricate miniature scenes, and the kind of assured draughtsmanship that suggests a master workshop at the height of Catalan Gothic art. Check the National Museum's schedule for display periods before planning your visit around it.