The Baptistery of Saint John is a religious building located in Florence, Italy. It is one of the oldest structures in the city, dating back to the 11th century. The baptistery is renowned for its stunning Romanesque architecture and intricate mosaics, particularly the golden ceiling that depicts scenes from the Bible. The baptistery is dedicated to Saint John the Baptist, the patron saint of Florence. It is famous for its three sets of bronze doors, especially the Gates of Paradise, created by the artist Lorenzo Ghiberti. The building serves as a significant site for Christian baptisms and ceremonies.