St. John the Baptist is also the patron saint of Florence, Italy and the magnificent baptistry of the city is dedicated to him. Until the 1800's, all Catholics of Florence are said to be baptized inside the glorious edifice.
While many people are happy at the sight of the exteriors of the baptistry (the gilded doors are magnificent!), any visitor should not fail to go inside and see the majestic decor of the dome, stiff neck and dizziness notwithstanding. It's the history of salvation in gold!