Architectural features of interest include the church's south-west portico, a crenellated structure with sculpture that is a major masterpiece of Romanesque art. This reflected an expansion of image carving both in scope and size, and extended the use of sculpture from the sanctuary to the public exterior.[3]
The tympanum depicts the Apocalypse of the Book of Revelation. Supporting the tympanum, a trumeau features a statue of the Prophet Isaiah, an outstanding example of Romanesque sculpture, comparable to the work at Santo Domingo de Silos. The cloisters also feature Romanesque sculpture.