The Cathedral of Sant'Andrea dominates the main piazza of Amalfi with its extraordinary 13th-century façade: alternating bands of dark and white marble, Arabic-Norman interlacing arches, and a magnificent bronze door cast in Constantinople in 1066. The Arab-Norman architecture reflects Amalfi's medieval cosmopolitanism — the republic traded extensively with the Byzantine and Arab worlds, and the style of its cathedral shows it.
The interior was heavily remodelled in the 18th century but the cloister — the Chiostro del Paradiso, built in 1266 — survived intact. It is one of the finest Romanesque cloisters in southern Italy: slender paired columns with interlaced pointed arches, decorated with cross-shaped mosaic inlays, surrounding a garden of palms and sarcophagi. The crypt below the main church holds the bones of Saint Andrew. Entry to the cathedral is free; the museum and cloister charge a small admission.