Baptistry of Neon

The Baptistry of Neon (Italian: Battistero Neoniano) is a religious building in Ravenna, central Italy. The most ancient monument remaining in the city, it was partly erected on the site of a Roman bath. It is also called the Orthodox Baptistry to distinguish it from the Arian Baptistry constructed on behest of Ostrogothic King Theodoric some 50 years later.

• http://en.wikipedia.org/wiki/Baptistry of Neon