The Battistero degli Ortodossi is the most ancient of Ravenna's monuments, dating from the late 4th to early 5th centuries.
The dome of the baptistery has fantastic mosaics depicting Christ being baptized by John the Baptist, the group of apostles preparing for the baptism, and the heavenly paradise.
In addition to mosaics, the interior holds the bronze cross from 688, the original marble ambo of the baptistery (my camera was resting on it to take the opening picture), and a 5th century altar.
Declared a World Heritage's humanity site by Unesco, inside is a baptismal font made up of fragments of ancient greek marble and porphyry.
Two tiers of arches decorated with bas-reliefs and mosaics with the Dome mosaic in three concentric circles: in the center St. John is baptizing Christ in the Jordan, in the midst of the Apostles bearing crowns; triumphal altars and thrones are depicted outside