Ravenna’s Orthodox Baptistry, also known as the Baptistry of Neon, is the city’s oldest Christian monument. Its dome is filled with beautiful mosaics representing the baptism of Christ by John the Baptist, and images of the twelve apostles surround this central medallion. Built in the 5th century, the building is now almost 10 feet underground.
Along with seven other Ravenna structures, the Orthodox Baptistry is a UNESCO World Heritage site.