The Baptistery of San Giovanni an octagonal thirteenth-century religious building standing just in front of the Duomo of Volterra, in the center of the city.

It was supposedly first built in the seventh century at the site of a Roman temple dedicated to Sun worship.

[1] The façade is decorated with horizontal bands of white and dark green marble.

It has a painting (partially damaged during World War Two of the Assumption of the Virgin by Niccolò Circignani.

[4] Above it rises a statue of St John the Baptist (1771) by Giovanni Antonio Cybei.