For mosaic lovers, Ravenna is an earthly paradise. Spread out over several churches and baptisteries around town is one of the world's most dazzling collections of early Christian mosaic artwork, enshrined since 1996 on Unesco's World Heritage list. Wandering through the unassuming town centre today, you'd never imagine that for a three-century span beginning in AD 402, Ravenna served as capital of the Western Roman Empire, chief city of the Ostrogoth Kingdom of Italy and nexus of a powerful Byzantine exarchate. During this prolonged golden age, while the rest of the Italian peninsula flailed in the wake of Barbarian invasions, Ravenna became a fertile art studio for skilled craftsmen, who covered the city's terracotta brick churches in heart-rendingly beautiful mosaics.