Cathedral Basilica of Saints Mary & Donato

This guide to the Cathedral Basilica of Saints Mary and Donato in Venice starts with four huge rib bones hanging behind the altar, which locals say belonged to a dragon slain by a wonder-working bishop named Donatus in Greece. It follows the relics' journey west, brought here around 1125 by the Venetian doge Domenico Michiel returning from a crusade, and the church's grand rebuilding that followed. Look down as you listen, too: the mosaic floor beneath your feet was laid the very year that rebuilding finished.