This building, whose architectural lines and decorative elements recall Pugliese Romanesque, is all that remains of the original abbey complex destroys by a fire in 1183.
The elegance of the construction is discernible in the lines of the brick faĆĀ§ade, divided in three parts by reinforcement pillars that frame portals surmounted by windows.
The best expression, however, is in the basilica interior, a nave and two aisles, with a stone floor, jutting transept and slightly curved apses.
The cycle of frescoes, the most interesting dated 1182, that covers the transept domes and wall is extremely important for the history of pictorial art in Abruzzo since it is the link between the northern schools and the original re-elaboration of experience in the region.