The church that has survived today dates back to the 11th-12th centuries, has a Latin cross plan, with three apses. The facade has no relevant decorative elements, except for a bas-relief on the lunette of the portal. In the external walls of the church are inserted tombstones and various inscriptions from the Roman and medieval times, while, on the right, stands a mighty bell tower, completed in 1329 by the Abbot Nicola, consisting of a crenellated Gothic tower with three-light windows on the arches .
The interior of the church is austere and has three naves, each ending in a semicircular apse. Along the central nave there is a valuable ambo, finely decorated, built in 1223, partly with older reused materials. The ambo is supported by three unequal arches and, under the parapet, there are seven small aedicules: the central one must have supported an eagle which, with its outstretched wings, served as a lectern. The others are occupied by six monks in high relief, intent on the activities that represent the monastic rule of the ora et labora.
Behind the high altar is the statue of the Madonna di Canneto, dating back to the 14th century, in Gothic style, and also known as the Virgin of the Smile.
In the area adjacent to the church, there are archaeological excavations which have brought to light the remains of a Roman villa from the 1st century AD.