A long time ago, Ravenna flourished: under the Romans – the most important port, from the beginning of the 5th century – the capital of the Western Roman Empire, from the end of the 5th century – the capital of the barbarian kingdom. Then the Byzantines came and decorated it with mosaics. But the sea left, the old port was abandoned. The Byzantines were replaced by the Lombards, the Lombards by the Franks, the local feudal lords, the Venetians…
I love such fallen asleep great cities that have preserved something valuable.