Baptistry of San Giovanni is one of the most ancient buildings in Florence. It is designed on an octagonal plan and encades in white and green marble. Spend your time here admiring the famous bronze doors portraying a sort of giant bible. For just 3 EUR you can get inside to experience the unique atmosphere inspired by a segmented cupola glowing with 13th century golden plated mosaics of Byzantine style. Here you will see a fresco of 1342 depicting the oldest known view of Florence.