One of the richest collections of sacred relics in Hungary, this treasury features Gothic chalices, a Renaissance mitre embroidered with pearls, a 14th-century gold monstrance from Budapest’s Clarissa Convent and a bloodied part of Bishop Vilmos’s shirt. The showstopper here is the priceless library, containing almost 70,000 volumes printed before 1850, including an 11th-century codex.