This was one of the first buildings built after the Medicis took over the city. It has a Latin cross design and a single nave with an octagonal dome. The baroque interior houses many works of art. The main altar was built by dei Flaminio, and was conducted over 24 years, from 1617, to 1631. Here you can see the terracotta bust of Madonna di Provenzano. In this square you have a beautiful view of the Tuscan landscape.