From the train station it is about a 15 minute walk to the old town of Ravenna. The centre is mostly pedestrian streets and the town has a lively feel to it. First up is the Arian Baptistry. And there, on the ceiling:
To modern eyes this may be John the Baptist baptizing Jesus, observed by his apostles. Back in the day this was pretty seriously heretical, showing Jesus young and obviously human, attended by a pagan river spirit as well as saints.
The magnificent mosaics of the dome are all that remain in this small building.
The real fireworks begin at the Basilica de San Vitale: