The Baptistery of San Giovanni is a historic religious building located in Florence, Italy. It is renowned for its stunning architecture, featuring a circular design and a striking dome. The structure is primarily made of white and green marble, showcasing intricate mosaics and sculptures that reflect the artistry of the Renaissance period. Constructed between the 11th and 12th centuries, the baptistery is dedicated to Saint John the Baptist, the patron saint of Florence. It is one of the oldest buildings in the city and serves as a significant site for Christian baptisms, including those of notable figures like Dante Alighieri and Cosimo de' Medici.