Baptistry of Neon
Located in Ravenna · Website: www.ravennamosaici.it/musei/battistero-neoniano/
Wikipedia
The Baptistery of Neon (Italian: Battistero Neoniano) is a Roman religious building in Ravenna, northeastern 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 Baptistery to distinguish it from the Arian Baptistery constructed on behest of Ostrogothic King Theodoric some 50 years later.