The Baptistery of Neon in Ravenna, also known as the Orthodox Baptistery, is a prominent early Christian structure built in the 5th century. It is famous for its stunning mosaics that reflect Christian themes and symbolizes the importance of baptism in early Christian life. This architectural marvel serves as an example of the transition from Roman to early Christian architecture, showcasing elements like a central plan and the use of light to create an uplifting spiritual environment.