Pieve di Santa Maria is one of the main Romanesque churches in Toscana.
It was built in 1140 over a church dating of before 1000; it was enriched with Gothic elements in the 14th century and restored in the 19th century. Its Romanesque façade of the 13th century has five blind arches and three series of loggias. The bell-tower of 1330 is called campanile delle cento buche ("hundred-hole bell-tower") due to its twin lancet windows. >
The apsis borders Piazza Grande.
The dark inside of the church is divided into a nave and two aisles. The most ancient part is the presbytery, located over the crypt. The main artistic attraction is the large polyptych on the high altar. It portrays a Madonna with Child and Saints, the Annunciation, the Assumption and twelve Saints and it was made by Pietro Lorenzetti in 1320-24.